On 02/04/2019 10:48, Andreas Thienemann wrote: > Hi, > > I have a locally developed milter using the python-milter bindings > which seems to trigger a Postfix bug. > > The milter in question uses the smfi_setmlreply() command to set a > multiline response as defined in rfc5321. > > Multiline replies should result in the smtpd replying with something > like the following to e.g. a rejected DATA command: > > 450-4.7.1 Line 1 > 450-4.7.1 Line 2 > 450 4.7.1 Line 3 > > Postfix however seems to fold the reply into a single line: > > 450-4.7.1 Line 1 450-4.7.1 Line 2 450 4.7.1 Line 3
The output you sent shows what the smtpd server replies to the client and shows a different behaviour between sendmail and postfix when the milter uses smfi_setmlreply(). It does not show that postfix is receiving multiple reply lines from the milter and folding them, though of course you may be right about it. If you want to investigate this further you could turn on verbose logging on the smtpd and cleanup processes and you will see a bit more info about what is happening. If I'm reading this correctly the end of message milter is being evaluated in the cleanup process in cleanup_milter_apply for event SMFIC_BODYEOB. The cleanup process then sends the reject reason to the smtpd process. John
