Fix Postfix "Relay access denied" errors
Why Postfix answers 454 4.7.1 Relay access denied, the three causes behind it, and the exact postconf fixes that do not turn your VPS into an open relay.
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Ubuntu 26.10 on a server: what changes
Ubuntu 26.10 splits OpenSSH, removes the OpenSSL engine, deprecates Postfix hash maps and moves MySQL to 9.7. What to check on a 26.04 VPS before the next LTS.