The option, "Print the 'Return-Path' header in all list emails" probably will work, but the Return-Path header will be ignored by your mail server - it's a pretty useless option and, as you can see, it's tucked away under the, "Misc Options" I used to use it when the server I was hosted at was running w/Qmail
Dada Mail then, can only hint to the mail server what the Return-Path should be, and the mail server will ultimately decide what to set it as Strange it doesn't set it to anything though The sendmail command that comes with Postfix does talk about the -f header:
http://www
postfix
org/sendmail
1
html
For its description, it seems to be doing the right thing So, good mystery to me Perhaps attempt to send that same server via SMTP?
Can't comment myself on the DKIM problems - that should be happening in the mail server itself
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