I noticed that I can set the sender address of the reject messages in imapd.conf using the postmaster: parameter. Is the correct solution to this problem to set the postmaster: to rejected or something like that doesn't corresspond to a real user or alias on our domain ?
Yes, I think it is. We use doublebounce, which is aliased to /dev/null, for these purposes ...
Greetings, Sebastian -- Sebastian Hagedorn M.A. - Postmaster - RZKR-R1 (Flachbau), Zimmer 18 Zentrum für angewandte Informatik - Universitätsweiter Service RRZK Universität zu Köln / Cologne University - Tel. +49-221-478-5587