Me:  I'd like to add email support to this bot. Let's think through
     how we would do this.

LLM: Good overview acquired. Here's what I see and the questions we
     need to resolve:

     ## Current pattern

     All channels follow the same flow: inbound webhook/listener →
     enqueueMessage(message, source, sender, attachments) → LLM
     processes → LLM calls send_*_message tool to reply. Channels are
     either in-process (Telegram webhooks, WhatsApp via Baileys) or
     separate containers (Signal bridge). Email would be a new channel
     following this same pattern.

     ## Key design questions

     1. Inbound — how does email arrive?
        - IMAP polling (simplest — poll a mailbox on a timer, works
          with any provider)
        - Webhook from a transactional email service (SendGrid/Mailgun
          inbound parse — requires that service)
        - Run an SMTP server (most complex, requires DNS/MX setup)

     2. Outbound — how do we send?
        - SMTP client (works with any provider — Gmail, Fastmail,
          self-hosted)
        - Transactional email API (SendGrid/Mailgun API)

     3. What's your actual use case? This affects several decisions:
        - Full bidirectional conversation (reply to emails, maintain
          threads)?
        - One-way notifications from the bot?
        - Processing incoming emails (e.g., forwarded emails,
          digests)?

     4. Architecture — separate container or in-process?
        Signal uses a bridge container because signal-cli is a heavy
        Java process. Email libraries are lightweight, so in-process
        (like Telegram) is viable. But the AGENTS.md rule about not
        adding runtimes to the app container doesn't apply here since
        it's just TypeScript/Node.

     5. Email-specific concerns:
        - How to handle HTML emails? Strip to plain text? Pass a
          markdown conversion to the LLM?
        - Thread tracking — match replies to conversations by
          In-Reply-To/References headers, or treat each email
          independently?
        - Attachments — needed?

     What's the scenario you're envisioning? That'll narrow this down
     fast.

Me:  1. Email will arrive from a webhook, yes. I will create a
     Cloudflare Email worker that will forward the entire body of the
     email via webhook. It'll upload a JSON version of the message:

     {"from":"me@mydomain.com", etc}

     2. SMTP client

     3. Full bidirectional conversation, yes. This will be the same as
     how interlocutors work with the other transports, if someone sends
     an email to the bot, it will be ignored unless they are set up as
     an interlocutor. The owner can also send emails or forward emails
     for processing.

     4. In-process, since this will be a webhook.

     5. Markdown conversion, yes. Let's treat each email independently
     for now, and then we can change that if necessary. Attachments are
     needed, they should work like any other platform, the agent will
     receive them as files.

     The scenario I'm envisioning is both being able to correspond with
     people over email via subagents (like the bot currently does with
     Signal/Telegram/Whatsapp) and the owner being able to forward
     emails (e.g. a confirmation email for a booking) for the bot to
     process and ingest the info. Does this make sense? What edge cases
     can you foresee, or is there something you're worried about?

LLM: This makes sense and fits cleanly into the existing channel
     pattern. Here are my observations and the edge cases I see:

     ## Concerns and edge cases

     1. MIME parsing is non-trivial. Plain text emails are easy, but
        real-world emails are multipart MIME (HTML+text alternatives,
        inline images, attachments, nested multipart parts, various
        character encodings). We should use mailparser (from the
        Nodemailer project) to parse the raw RFC 2822 message
        server-side rather than trying to handle this in the worker.
        This means the worker payload can be minimal — just from, to,
        and raw.

     2. Webhook authentication. The endpoint must be public (Cloudflare
        can't do a browser login), but we need to prevent anyone from
        POSTing fake emails. Simplest approach matching the Telegram
        pattern: generate a random secret on startup, but since we
        can't call back to Cloudflare to register it, we'd configure a
        shared secret in config.toml and have the worker send it as a
        header. The endpoint validates it.

     3. Outbound emails need a subject line. Every other channel is
        subject-less, but email requires one. The send_email tool needs
        a subject parameter that the LLM provides. This is a new thing
        for the agent to handle.

     4. HTML-only emails. Some emails have no plain text part at all.
        mailparser can extract textAsHtml which we'd convert to
        markdown. The html-to-text library handles this well, or
        mailparser itself provides a .text property that does basic
        HTML stripping.

     5. From address identity. For outbound SMTP, the from address must
        match what the SMTP server allows. This is a config value. If
        someone emails bot@mydomain.com, the reply should come from
        that address.

     6. Forwarded emails for processing. When the owner forwards an
        email, the original sender's address will be in the forwarded
        body, not in the from field (which will be the owner's
        address). The LLM will need to understand this contextually —
        no special code needed, the forwarded content will just be in
        the message body. This should work naturally.

     7. Attachments on outbound. The existing send_*_message tools
        support attachments via file paths. send_email would need the
        same, using nodemailer to attach files. This is
        straightforward.

     ## Proposed design

     Worker simplification:
       // Only send what we need — parse everything from raw
       // server-side
       const payload = {
         from: message.from,
         to: message.to,
         raw: rawEmail
       };
       // Add auth header
       headers: {
         "Authorization": "Bearer <secret>",
         "Content-Type": "application/json"
       }

     Config (config.toml):
       [email]
       smtp_host = "smtp.example.com"
       smtp_port = 465
       smtp_user = "..."
       smtp_password = "..."
       from_address = "bot@mydomain.com"
       webhook_secret = "some-random-secret"

     Inbound flow:
       - POST /email/webhook (public route, validated by webhook_secret
         header)
       - Parse raw with mailparser → extract subject, text body (with
         HTML fallback → markdown), attachments
       - Format message to LLM as: Subject: ...\n\n<body>
       - Save attachments via saveAttachment()
       - enqueueMessage(message, "email", senderEmailAddress,
         attachments)
       - Add "email" to GATED_SOURCES, add email handling to
         isInAllowlist()

     Outbound flow:
       - New send_email tool with params: to, subject, body
         (markdown), attachments (optional file paths)
       - Convert markdown body to HTML for the email (with plain text
         fallback)
       - Send via nodemailer SMTP transport
       - Interlocutor identity service: "email", identifier: email
         address

     New dependencies: mailparser, nodemailer, html-to-text (or we can
     rely on mailparser's built-in text extraction and skip
     html-to-text initially — we can add it if the quality is
     insufficient).

     Files touched:
       - src/email.ts — new file: webhook handler, MIME parsing,
         inbound processing
       - src/email-api.ts — new file: SMTP sending via nodemailer
       - src/agent.ts — add send_email tool definition
       - src/config.ts — add EmailConfig interface and load it
       - src/index.ts — add /email/webhook route, whitelist it in
         isPublicRoute()
       - src/queue.ts — add "email" to GATED_SOURCES
       - src/allowlist.ts — add email channel handling
       - config.example.toml — add [email] section

     Explicitly not doing (YAGNI):
       - Email threading / In-Reply-To headers (you said treat
         independently)
       - CC/BCC handling
       - Bounce handling
       - Read receipts
       - Rate limiting
       - Email signature stripping (LLM can handle this contextually)

     Does this look right? Anything you'd change before I write it up
     as tasks?

Me:  Make sure to update the README.md and config.example.toml as
     well. Also remember to change the email allowlist page to not
     validate E.164 for these

LLM: Good, now I have the full picture. Here's the updated agreement:

     ## Requirements

     1. Inbound email via Cloudflare Email Worker webhook → POST
        /email/webhook (public, authenticated by shared secret)
     2. Outbound email via SMTP (nodemailer) through a send_email tool
        (with to, subject, body, optional attachments)
     3. Gated channel — email added to GATED_SOURCES, allowlist, and
        interlocutor identity system (service: "email", identifier:
        email address)
     4. Allowlist UI — new "Email allowlist" section in the settings
        page; validates email format (not E.164)
     5. Allowlist data — Allowlist interface gains an email: string[]
        field; backend validation accepts email addresses
     6. Owner config — owner.email in config.toml, auto-seeded into
        allowlist like the other channels
     7. MIME parsing — use mailparser to extract subject, text body
        (HTML fallback), and attachments from the raw RFC 2822 message
     8. Message format to LLM — Subject: <subject>\n\n<body> so the
        agent sees what the email is about
     9. Config — new [email] section: smtp_host, smtp_port, smtp_user,
        smtp_password, from_address, webhook_secret
     10. Update config.example.toml, README.md

     ## Constraints

     - In-process (no new container)
     - Email is optional — if [email] is absent from config, no email
       functionality loads (like the other optional channels)
     - Follow existing patterns exactly (webhook handling like
       Telegram, allowlist like WhatsApp/Signal, tool definition like
       other send tools)

     ## Success criteria

     - Can receive an email via webhook, have it processed by the LLM,
       and the LLM can reply via send_email
     - Allowlist UI works for email addresses
     - Owner email auto-seeded into allowlist
     - Builds and passes existing tests; new tests for the webhook
       handler and allowlist validation

     ## Non-goals / out of scope

     - Email threading (In-Reply-To / References headers)
     - CC/BCC handling
     - Bounce/delivery-status handling
     - Read receipts
     - Email signature stripping
     - Rate limiting
     - Markdown-to-HTML conversion for outbound body (plain text is
       fine for now — we can add this later)

     One question before I write up tasks: for outbound, should the
     body be sent as plain text only, or do you want HTML emails
     (converting the LLM's markdown to HTML)? Plain text is simpler
     and works everywhere, but HTML looks nicer. I'd lean toward plain
     text for now and adding HTML later if desired.

     Also — the worker payload. I'd simplify it to just { from, to,
     raw } and parse everything server-side from raw. That way you
     don't need to maintain parsing logic in the worker. Sound good?

Me:  Add instructions to the config.example.toml for setting this up,
     including the actual Cloudflare worker to use

LLM: Got it — the config.example.toml will include the worker code and
     setup instructions in comments. Let me update the plan with that
     and present the full task breakdown.

     Regarding my two open questions that you didn't address:

     1. Outbound body format — I'll go with plain text for now (YAGNI).
        We can add markdown→HTML conversion later.
     2. Worker payload — I'll simplify to { from, to, raw } with an
        auth header, and parse everything from raw server-side.

     ## Proposed plan directory

     misc/coding-team/email-support/

     ## Task breakdown

     1. Config and dependencies — Add EmailConfig interface to
        config.ts, [email] section to config.example.toml (with
        Cloudflare worker setup instructions), install mailparser and
        nodemailer (plus their @types/ packages). Add owner.email to
        OwnerConfig.

     2. Allowlist — Add email: string[] to the Allowlist interface,
        update validateAllowlist, loadAllowlist (owner email
        auto-seed), getAllowlist, isInAllowlist,
        getOwnerIdentities. Add "email" to GATED_SOURCES in queue.ts.

     3. Allowlist UI and backend validation — Add the "Email allowlist"
        section to the settings page HTML/JS (with email format
        validation instead of E.164), update handlePutAllowlistRequest
        to validate and accept the email array, update saveAllowlist
        serialization (including notes key pruning and owner identity
        merging).

     4. Inbound email — New src/email.ts: webhook handler that
        validates the secret, parses the raw email with mailparser,
        extracts subject + text body + attachments, saves attachments,
        and calls enqueueMessage. Add the /email/webhook route to
        index.ts and whitelist it in isPublicRoute.

     5. Outbound email — New src/email-api.ts: nodemailer SMTP
        transport setup and send function. Add send_email tool to
        agent.ts (params: recipient, subject, body, optional
        attachments), following the same pattern as the other send
        tools (interlocutor lookup, allowlist check).

     6. README and tests — Update README.md to document email support.
        Add tests for the webhook handler validation and allowlist
        email validation in the existing test files.

     Does this look right? Say "approved" to proceed.

Me:  Regarding your questions, 1. Plain text. 2. Yes, simplify as much
     as possible

LLM: Noted. The plan is as stated above. Say "approved" to proceed.

Me:  Approved.

Me:  By the way, what will an email look like to the bot? Will it be
     able to see the subject as well as the body?

LLM: Yes — the plan is to format the inbound message to the LLM as:

       Subject: Hello!

       Hi, this is the body of the email.

     So the subject is visible as a prefix, separated from the body by
     a blank line. This mirrors how you'd naturally read an email and
     gives the LLM enough context to understand what the email is about
     (especially useful for forwarded emails where the subject line
     carries meaning).

     For outbound, the send_email tool has a subject parameter, so the
     LLM will compose a subject line when replying.

Me:  Excellent, please continue

LLM: All 6 tasks are implemented. Here's what was done:

     New files:
       - src/email.ts — inbound webhook handler (validates Bearer
         token auth, parses raw RFC 2822 email with mailparser,
         extracts subject/body/attachments, checks allowlist, enqueues
         message)
       - src/email-api.ts — outbound SMTP transport (nodemailer, plain
         text emails with optional attachments)
       - src/email.test.ts — webhook auth tests

     Modified files:
       - src/config.ts — EmailConfig interface, email field on Config
         and OwnerConfig
       - src/allowlist.ts — email: string[] on Allowlist,
         case-insensitive matching, owner seeding
       - src/allowlist.test.ts — 12 new email allowlist tests
       - src/settings.ts — email allowlist UI section + backend
         validation (email format, not E.164)
       - src/settings.test.ts — 9 new email backend validation tests
       - src/queue.ts — "email" added to GATED_SOURCES
       - src/agent.ts — createSendEmailTool (recipient resolution,
         allowlist gate, SMTP send)
       - src/agent-send-tools.test.ts — email send tool tests
       - src/index.ts — /email/webhook route + isPublicRoute entry +
         initializeEmailTransport at startup
       - config.example.toml — full [email] section with setup
         instructions and Cloudflare Worker code
       - README.md — email setup section, updated feature list and
         architecture blurb
       - package.json / package-lock.json — mailparser, nodemailer,
         and their type packages

     Test results: 421 tests passing, TypeScript type-check clean.

     Worker change needed on your side: Update your Cloudflare Worker
     to the simplified version in config.example.toml — sends { from,
     to, raw } with Authorization: Bearer <secret> header, and point
     it at https://<publicHostname>/email/webhook.

     What would you like to do next?

Me:  What do we check here, regarding the email parameters? I'm
     wondering whether we can have inbound emails working even if the
     user doesn't configure outbound emails. How hard would that be to
     implement?

LLM: Here's the current situation:

     - EmailConfig requires all 6 fields (smtp host/port/user/password,
       fromAddress, webhookSecret) — they're all non-optional
       strings/numbers.
     - config.email gates everything: the webhook route, the SMTP
       transport initialization, and the send_email tool.

     So right now, if you only want inbound email (webhook), you'd
     still have to fill in all the SMTP fields with dummy values, which
     is ugly.

     The fix is straightforward — make the SMTP fields optional in
     EmailConfig. Then:

     - Webhook route: only needs webhookSecret → enabled whenever
       config.email exists.
     - SMTP transport init: only runs when the SMTP fields are present.
     - send_email tool: only registered when the SMTP fields are
       present.

     The change is small: make smtpHost, smtpPort, smtpUser,
     smtpPassword, and fromAddress optional in the interface, gate
     initializeEmailTransport and createSendEmailTool on their
     presence, and the webhook handler keeps working with just
     webhookSecret. Want me to do this?

Me:  Yes please

LLM: Done. Here's what changed:

     - EmailConfig.webhookSecret is the only required field now. The 5
       SMTP fields (smtpHost, smtpPort, smtpUser, smtpPassword,
       fromAddress) are all optional.
     - The webhook route works with just webhookSecret — inbound email
       is fully functional without any SMTP config.
     - The SMTP transport and send_email tool only initialize when
       smtpHost is present.
     - config.example.toml now clearly groups and labels the required
       vs optional fields.

     All 421 tests pass, type-check clean. What would you like to do
     next?

Me:  I've sent an email, having specified owner.email, but the agent
     dropped it:

     [stavrobot] Dropping message: could not resolve target agent.
     source=email, sender=me@mydomain.com

     Also, the "to" seems truncated

LLM: Found it. Issue 1 (dropped message): seedOwnerInterlocutor
     builds the ownerIdentitySet from Signal, Telegram, and WhatsApp
     identities, but never adds email. So
     isOwnerIdentity("email", "me@mydomain.com") returns false, the
     owner bypass is skipped, and the message falls through to the
     allowlist check and interlocutor lookup — which probably also
     fails because there's no interlocutor record with an email
     identity yet.

     The "To" truncation in the logs — that's coming from the message
     format Subject: ...\n\nFrom: ...\nTo: .... That looks like the
     email body content being logged (the preview on line 181 of
     queue.ts truncates to 200 chars). The To: is from the email
     headers included in the body text by mailparser. The truncation is
     just the 200-char log preview cutting off — not an actual data
     issue. The full message is intact.

     So there's really just one bug: seedOwnerInterlocutor doesn't
     register owner.email as an owner identity.

LLM: Fixed. The bug was that seedOwnerInterlocutor in database.ts
     built the owner identity set from Signal, Telegram, and WhatsApp
     but never added email. So
     isOwnerIdentity("email", "me@mydomain.com") returned false, the
     owner bypass was skipped, and the message was dropped because
     there was no interlocutor record to route to either.

     The "To" truncation in the logs is just the 200-character message
     preview in queue.ts cutting off — the actual message data is
     intact.

     After rebuilding, your owner emails should route to the main agent
     correctly. Want to test it?

Me:  We have a list of sources, right? Why is that list not used for
     this, and we've hardcoded it instead?

LLM: You're right. The owner identity seeding in
     seedOwnerInterlocutor has a separate hardcoded if block for each
     channel — Signal, Telegram, WhatsApp, and now email. Meanwhile
     OwnerConfig already has the channel names as field keys. Every
     time a new channel is added, someone has to remember to add
     another if block there, which is exactly how this bug happened.

     The fix would be to iterate over a shared list of channel names
     (or just iterate the OwnerConfig fields dynamically) instead of
     having per-channel if blocks. The same pattern applies to
     getOwnerIdentities in allowlist.ts, which also has per-channel
     blocks.

     However — OwnerConfig has a name field that isn't a channel, and
     Telegram's identifier needs special handling (it's a numeric
     string converted to a number for the allowlist). So a fully
     generic loop isn't completely trivial, but it's still better than
     the current approach.

     The simplest version: define a list of channel keys (e.g.
     ["signal", "telegram", "whatsapp", "email"]) in one place, and
     have seedOwnerInterlocutor loop over it. Want me to do this
     cleanup, or would you rather keep moving and revisit it later?

Me:  The special cases give me pause. The name is probably fine, as we
     can ignore, that, but the Telegram conversion is more special.
     What do you think?

LLM: The Telegram numeric conversion only matters in the allowlist
     (isInAllowlist compares numbers, getOwnerIdentities returns
     number[] for Telegram). But in seedOwnerInterlocutor, all
     identities are stored as strings in interlocutor_identities —
     even Telegram. So the seeding loop doesn't actually need any
     special cases. It's just:

       for (const channel of CHANNELS) {
         const value = ownerConfig[channel];
         if (value !== undefined) {
           identities.push({
             service: channel,
             identifier: channel === "email"
               ? value.toLowerCase()
               : value
           });
         }
       }

     ...though that introduces a special case for email lowercasing.
     Which is arguably also wrong — we should probably lowercase email
     everywhere it enters the system (allowlist seeding, inbound
     webhook, etc.) rather than in the identity loop.

     The more I think about it, the more I think the cleanup is worth
     doing for seedOwnerInterlocutor (where everything is strings
     anyway), but getOwnerIdentities in allowlist.ts has genuinely
     different return types per channel (string[] vs number[]), so
     forcing that into a generic loop would make it worse, not better.

     My recommendation: make the channel list a shared constant, use it
     in seedOwnerInterlocutor to loop, but leave getOwnerIdentities
     as-is since its per-channel type differences are inherent. That
     way the "forgot to add a new channel" bug class is eliminated for
     the seeding path, which is the one that just bit us.

Me:  Ok, approved

LLM: Done. The four per-channel if blocks are replaced with a loop
     over OWNER_CHANNELS defined in config.ts. Next time a channel is
     added, it just needs to be appended to that array. All 421 tests
     pass.

     Want to rebuild and test the email flow again?

Me:  There is one wrinkle: Email whitelists are special, as someone
     might control an entire domain. Can we add asterisks to the email
     whitelist? For example, I'd like my (owner) email address to be
     "*@example.com", rather than just "me@example.com"

LLM: Makes sense — domain-level wildcards are a natural fit for email
     that doesn't exist for phone-number-based channels.

     The allowlist matching is straightforward: entries like
     *@example.com match any sender whose domain matches. The changes
     would be in isInAllowlist (matching logic), the settings UI and
     backend validation (accept the *@domain pattern), and tests.

     One question: should owner.email also support *@example.com? I'd
     lean no — the owner is a specific person, and the owner identity
     is used for exact-match routing (bypassing the interlocutor
     lookup). If owner.email is *@example.com, then any email from
     that domain would be treated as the owner, which seems wrong.
     You'd probably want owner.email = "me@example.com" for routing,
     and *@example.com in the allowlist for letting others through.

     Does that distinction make sense, or do you actually want the
     owner identity to be domain-wide too?

Me:  No, the whole issue is that I use disposable email addresses
     "company@mydomain.com", and forwarding those emails means that
     the email comes from the disposable email I used, so the bot
     drops them. I can't easily send the emails from my main address
     without changing it on every single email, so I'd rather the bot
     treated the entire domain as one person (if the wildcard is set
     that way). What is the issue with this?

LLM: The issue I was worried about is that isOwnerIdentity does an
     exact string match —
     ownerIdentitySet.has("email:me@mydomain.com"). If owner.email is
     *@mydomain.com, the set would contain
     "email:*@mydomain.com", and an incoming email from
     company@mydomain.com wouldn't match.

     But the fix is simple: make isOwnerIdentity understand domain
     wildcards for email, same as isInAllowlist. It's a few extra
     lines in one function. No real downside — if you control the
     domain, you are the owner regardless of which address you used.

     So the full scope is:

     1. isInAllowlist — email case checks for *@domain entries by
        comparing the sender's domain.
     2. isOwnerIdentity — same domain-wildcard matching for email
        entries in the owner identity set.
     3. Settings UI + backend validation — accept *@domain.com as a
        valid email allowlist entry.
     4. Tests for the new matching behavior.

     Want me to go ahead?

Me:  Please make sure that the local part (the wildcard) does not match
     the @ sign. I wouldn't want someone getting smart with validations
     and sending email from something like
     "me@mydomain.com"@evildomain.com and bypassing my owner check

LLM: Good catch. The matching logic will split on the last @ (or
     simply check that the sender's domain portion after @ matches
     exactly, and that the sender address contains exactly one @). That
     way "me@mydomain.com"@evildomain.com doesn't match
     *@mydomain.com.

Me:  Please also clarify in the config.example.toml that the local
     part can contain an asterisk

Me:  We should do proper matching, in case someone wants to match
     things like myusername+*@gmail.com, not just ignore the entire
     local part. Hopefully nobody's local part will contain a
     legitimate asterisk

Me:  If you use a regex, you need to escape every single other char in
     the email address

LLM: Done. The email allowlist now supports glob-style * wildcards:

     - *@mydomain.com — matches any address at the domain
     - myuser+*@gmail.com — matches any plus-tag for that user
     - exact@example.com — exact match only
     - * — allow everyone

     The * is translated to [^@]* in the regex, so it cannot match
     across the @ boundary — "me@good.com"@evil.com won't match
     *@good.com. This works in both the allowlist and the owner
     identity check.

Me:  Does this work both in the owner's `email = ` field and the
     allowlist page/the allowlist itself?

LLM: Yes, both:

     1. owner.email in config.toml — the value is stored in
        ownerEmailEntries and matched via matchesEmailEntry in
        isOwnerIdentity. So owner.email = "*@mydomain.com" treats any
        address from that domain as the owner.

     2. Allowlist (data layer + settings UI) — isInAllowlist for email
        uses matchesEmailEntry against every entry in the allowlist. So
        adding *@example.com via the settings page allows anyone from
        that domain.

     Both paths use the same matchesEmailEntry helper, so the matching
     behavior is identical.