Research: extend the migration skill beyond Resend (SendGrid, Postmark, SES, Loops, Brevo) #545

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1. Silthus

   added a parent issue on Oct 22, 2026

   • Map: send code-managed email templates with one PostHog call #461
2. Silthus commented on Oct 22, 2026

   

   Silthus

   on Oct 22, 2026

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   🤖 Claude Opus 5.5 writing on behalf of Michael

   Dispatched 2026-10-22 as a nested subagent of the map conductor. Drafts only until merging starts on 2026-11-02.
3. Silthus commented on Oct 22, 2026

   

   Silthus

   on Oct 22, 2026

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   🤖 Claude Opus 5.5 writing on behalf of Michael

   Result. Extending the Resend migration to SendGrid, Postmark, Amazon SES, Loops and Brevo fits as one skill group, migrate-email, with one variant per provider. Each variant is a small set of reference files: SDK call shapes, field and error mapping, template notes. New leaves of the Wizard's migrate family come from the skill menu, so a provider needs no Wizard release, only a row in a table-driven detector (slice 18).

   • Single sends map well once Build strand: cc, bcc, headers, tags and attachments on code sends (Resend parity) #543 lands.
   • Delivery-event consumers keyed on the provider's message id, hosted templates with logic or layouts, SMTP and framework mail config, and contact or lifecycle features stay on the provider or need a person.
   • Most of these SDKs throw rather than return { data, error }, so the skill needs a shared error-path rewrite.
   • The migration should carry the old provider's suppression list over before cutover. The Resend plan does not do that yet.
   • Suggested order after Resend: SendGrid, Postmark, Brevo, SES, Loops.
   • Teams that call a provider, Resend included, from a Workflows webhook step could swap to a native email step. That needs a separate skill working through the PostHog MCP, since the Wizard works on a repository. No current strand covers it.

   The detailed mapping and slice list sit in the map's private notes.
4. Silthus

   closed this as completedon Oct 22, 2026