I still can't find the cause of the problem. When I disable the sender_canonical_maps then SRS is not working, and when I then use i...@domain.com, then case folding is not happening for Return-Path. So the problem must be in the SRS rewriting or in the connection between PostSRSd and Postfix?
But I already asked the PostSRSd author and also checked the source code and it should work... Also, the log output mentions a correct rewrite without case folding. How can I easily debug what Postfix sends and/or receives to/from PostSRSd so I can debug further? I'm thinking the problem must be located somewhere around there...? Any other insights would be helpful! Thank you Wesley S. -- *Synio* *Ilgatlaan 9* *3500 Hasselt* *0477 71 79 25*