Web Reference: Specify " soft_bounce = yes" in the main.cf file to prevent the Postfix SMTP server from rejecting mail permanently, by changing all 5xx SMTP reply codes into 4xx. Jul 2, 2016 · Please edit your question to include the specific version of Postfix that you are running (including the package version, if applicable). I'm pretty sure we don't have to consider either Dovecot or MariaDB here. DevOps & SysAdmins: Postfix - How to prevent external clients from using my server as a relay? - YouTube
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