Carry attachment references inside the stored email body blob, resolve bytes on workers, and encode attachments for Gmail API and SMTP sends without changing the Kafka send-email contract.
Persist outbound warmup Message-IDs so later warmup replies can find thread parents.
Normalize reply headers and re-check partner health during recipient selection before using a mailbox as a warmup recipient.
Brings in PR #15 (email warmup process 4) plus its preceding commits:
customer-defined warmup routing on premium pool, free-trial warmup +
1 inbox for 14 days, customer webhook subscriptions with HMAC signing
+ retry, bumped default API rate limits to 100 req/s with flat per-
user/per-plan caps, plus dev-fixture additions.
One real conflict: internal/client/smtpimap/imap/client.go added
distinct imports on each side (this branch added 'net' for the
*net.TCPAddr BindIP field; main added 'sync' for a Mutex). Kept both.
Everything else auto-merged additively:
cmd/backend/main.go - imports + handler fields + DI lines
internal/api/handler/handler.go - new fields next to existing ones
internal/api/routes.go - new route group next to existing ones
Full build + test suite pass (no regressions).
SMTP and IMAP clients now expose a BindIP *net.TCPAddr field. When set,
outbound TCP binds to that IP; otherwise the netbind helper falls back to
WORKER_BIND_IP env var, then default route.
IMAP switched from raw tls.Dial to netbind.TLSDialer so the source IP is
configurable; behavior identical when BindIP is nil.
No call-site changes required: backwards compatible.
mark_read, mark_important, remove_from_spam, and move_to_warmbly now run
on outlook and custom smtp/imap mailboxes, not just gmail. routes by
provider in the worker handler. carries source mailbox UIDValidity on
the action so the worker can SELECT the right folder before mutating.
Matthew Meszaros