Hi, thanks for your fast reply.
@Truth Seeker: I added the message_size_limit statement to the definition in master.cf as I intended to increase the message size only for mail sent from my local users and not for all messages. > > > You can't change the size limit for the SMTP server alone. > > > It must be a main.cf setting. > > > > Specifically, message_size_limit is enforced by cleanup(8). Adding > > another cleanup(8) service with a different message_size_limit and > > choosing it for this particular smtpd(8) with cleanup_service_name > > should work. > > But wait, there is more... > > The queue manager and the delivery agents can be affected, too. > Depending on how mail gets into Postfix, recipient records may be > sitting at the end of a queue file, and when a delivery agent (or > queue manager) tries to mark a recipient as "done" they get into > trouble when their "message size limit" setting is too small. > > That was one of the bugs that was introduced by the VDA patch, Thanks Magnus for showing a way on how to achieve what I was trying to get and thanks Wietse for pointing out, that there may be some other problems with it. So I decided to go with the "save" configuration and increased the general message size in main.cf. Simon