Thank you for your reply!
Unfortunately this isn’t the solution, as I tested with and without asterisks. First I had it without, then with.
I just restarted the process, and it was finished with an error message, that the attachment was not found (although it is unchanged since Friday). The 56 bounced emails are still not marked as to be on the blacklist.
Do you know, how PHPList sends out email? Let’s say, I have a stack 10,000 email addresses. 9,000 work as they should.
Then I have 300 wrong email addresses. Will PHPList get stuck with this stack (as it is bigger than the batch size) and will constantly try to send the wrong emails, or does it skip this batch and move to the next (to return later)?