Operator notes on custom-domain email.

Long-form writing about provider-connected email, provider-native routing, the REST API, and the parts of the platform that show up in the security review.

Mailgun alternative for the send / receive path

Mailgun's hosted breadth (validation, lists, optimisation) is more than most teams need. Switch to Flowmails for send / receive; keep Mailgun only if you depend on its proprietary tools.

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