MSMTP treats 4xx errors as permanent errors. As an example:

msmtp: envelope from address [EMAIL PROTECTED] not accepted by the server
msmtp: server message: 451 4.7.1 Service unavailable - try again later
msmtp: could not send mail

Exit status: 65 = EX_DATAERR.

What I would expect when getting a 4xx is something like exit status 75 = 
EX_TEMPFAIL, which would allow me to use the exit status to tell the difference 
between an unsendable e-mail (e.g. an invalid receipient address), and a 
mailserver that doesn't want to talk right now (e.g. disk full). At the moment 
the both give EX_DATAERR.

Other temporary errors, like connection refused, already give different exit 
codes, and I use that to see which mails should stay in my queue directory for 
another try, and which to move to a different directory. But for 4xx errors, as 
they give EX_DATAERR, I currently use grep on the log files for the rejected 
mails, to see which are 4xx errors, and move them back to the queue directory.

Would it be a big change to get 4xx errors as something lige EX_TEMPFAIL?

/Kent


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