Hi! First, let's sort out the logs. Based on the IDs, there are 3 emails in the logs: 9E3A125A131F, S852542, 17D7825A1382.
The first one has only one line in the logs:
postfix-local[852542]: 9E3A125A131F: Could not change Return-Path in message envelope(SRS): No at sign in sender address
So the...