On Sat, Apr 08, 2023 at 11:51:06AM -0700, Doug Hardie via Postfix-users wrote:
> A couple of questions. Looking in the postfix generated Received:
> header, the SMTP id often has a few other letters included: ESMTPA
> etc. I am guessing that the extra letters mean:
>
> E - EHLO used rather the HELO
> S - SSL was used in the connection
> A - the originator was authenticated
>
> Are there any others and how close am I?
https://www.iana.org/assignments/mail-parameters/mail-parameters.xhtml#mail-parameters-7
> When the alias file pipes an email to a program, does it expect any
> response from that program,
Only a 0 exit status code, in which case the program should not generate
any output.
> or would it do anything with a response?
If an error occurs some of the output might be included in the bounce.
--
Viktor.
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