Hello, > > The other way round, passing from the filter to postfix only using UNIX > > sockets, is working. > > You're mistaken. On input, Postfix provides no LMTP server, and no > support for receiving messages from external programs via unix-domain > sockets.
I have the following line in master.cf: usmtp unix n - - - - smtpd And I can connect to /var/spool/postfix/public/usmtp with nc or other programs. Regards Christoph