Deliverability
Why mail lands in spam, and what actually fixes it. 8 articles.
SPF, DKIM and DMARC in plain English
Three records, three different jobs, and one relationship between them that explains almost every "why is my mail in spam" question.
6 min read →Why forwarded mail lands in spam
Forwarding 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.
5 min read →MTA-STS and TLS-RPT, and when they are worth it
SMTP encryption is opportunistic by default, which means it is trivially downgraded. These two records are the fix, and one of them is nearly free.
5 min read →Why a good mail server refuses instead of bouncing
Accepting a message you cannot deliver turns you into a spam cannon aimed at whoever was forged as the sender.
4 min read →Catch-all addresses are a spam magnet
Accepting anything@yourdomain feels convenient and quietly makes you the easiest target on the internet.
4 min read →Sending reputation is per IP and per domain, and they are not the same
Moving to a new IP does not reset your domain’s history, and a clean domain will not save a bad IP.
5 min read →Null MX: telling the world your domain does not receive mail
If a domain only sends, say so. It stops senders queueing for days and reduces what you get backscattered.
3 min read →The bulk sender rules, summarised
What the large providers now require, and which parts have real teeth.
5 min read →