On 2021-08-10 16:07:48, Mono DHS wrote: > And the right to reject non-SMTP input follows from operating an > SMTP MTA on the well-known TCP port 25, while at the same time holding > up the fundamental principle upon which the success of the Internet is > based, namely of being liberal in what one accepts and conservative in > what one sends.
Luckily, you get to decide precisely how liberal (or not) you want postfix to be in what it accepts, by overriding the default smtpd_hard_error_limit setting. If you want postfix to reject a connection immediately after the first SMTP protocol error it encounters, without the need to construct in advance a list of all possible errors, just set smtpd_hard_error_limit = 0. http://www.postfix.org/postconf.5.html#smtpd_hard_error_limit (Immediately underneath smtpd_forbidden_commands) Note: I'm not recommending this. I expect that the existing default has been arrived at after much observation and careful thought. But the option to do this is there if that's what you want. cheers, raf :)
