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Field notes
How mailbox providers actually decide where your mail lands, what wrecks a sending domain, and what to do about it. No theory that we have not run ourselves.
Verification4 min read
A catch-all domain says yes to every address you ask about, including ones that do not exist. Here is what is happening on the server, and what to do with the addresses that land in that group.
Deliverability4 min read
Gmail and Outlook both start filtering harder once a sender crosses a threshold most people never hear about until they are past it. What the number is, what counts towards it, and how long recovery takes.
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