Bill Cole via Postfix-users:
> On 2025-05-15 at 14:53:47 UTC-0400 (Thu, 15 May 2025 19:53:47 +0100)
> Maya Copeland via Postfix-users <m...@maya.cx>
> is rumored to have said:
>
> > I'd have thought it'd at least try, similar to how it does in when
> > using my
> > sendmail host. My configuration remained the same, except for changing
> > the
> > host to the machine running postfix instead.
>
> It is not reliable or even reasonable to expect a MUA to try
> authentication only after an attempt to send without authentication
> fails. Configure your MUA to authenticate by default and your problem
> should go away.
"But it works with Sendmail...."
It's decades since I implemented this part of the SMTP server.
There is a difference between Sendmail (sends 550) and Postfix
(sends 554). 554 is not listed as an RCPT TO response in RFC 821
(the protocol spec at the time), and it's also not listed as an
RCPT TO reply in RFC 521 (the current spec). My bad.
Unfortunately, htere is no simple way to chage this Postfix reply
code (other than flipping bits in the executable file).
Can you figure out a way to make he SMTP client send the "AUTH"
before sending "RCPT TO"?
eirydr
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