Gmail articles
Sending mail as your users without breaking their mailbox.
· 6 min read
Sent copies, Message-IDs, In-Reply-To, References, Gmail threadId rules and drafts across SMTP, Gmail and Graph.
Gmail push notifications: watch, Pub/Sub and history replay.
· 6 min read
users.watch, Pub/Sub grants, history.list replay, 404 resyncs and why polling stays on.