tmailrWriting · Deliverability
Deliverability
Why mail lands in spam, and what actually fixes it. 8 articles.
29 JulSPF, DKIM and DMARC in plain EnglishThree records, three different jobs, and one relationship between them that explains almost every "why is my mail in spam" question.3 min28 JulWhy forwarded mail lands in spamForwarding breaks SPF every single time, by design. What keeps forwarded mail out of the spam folder is DKIM surviving the trip, and that is easy to break.3 min25 JulMTA-STS and TLS-RPT, and when they are worth itSMTP encryption is opportunistic by default, which means it is trivially downgraded. These two records are the fix, and one of them is nearly free.2 min24 JulWhy a good mail server refuses instead of bouncingAccepting a message you cannot deliver turns you into a spam cannon aimed at whoever was forged as the sender.2 min20 JulCatch-all addresses are a spam magnetAccepting anything@yourdomain feels convenient and quietly makes you the easiest target on the internet.2 min14 JulSending reputation is per IP and per domain, and they are not the sameMoving to a new IP does not reset your domain’s history, and a clean domain will not save a bad IP.2 min11 JulNull MX: telling the world your domain does not receive mailIf a domain only sends, say so. It stops senders queueing for days and reduces what you get backscattered.2 min09 JulThe bulk sender rules, summarisedWhat the large providers now require, and which parts have real teeth.2 min
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