Mailing List From: Address
Please consider allowing configuration option to force Mailing Lists to use list email as "From" address. Some ISPs are blocking email from a mailing list user to themselves.
MDaemon 20.0.0 now includes an option to set the From header to be the email address of the list.
Mark Stennett commented
I just submitted a support request and included the transaction log. I do have that DMARC option checked but it is not working with many of the ISPs that have customers on my mailing lists.
This is what is happening:
Thu 2018-04-19 10:49:45.302:  <-- 550 rejecting spoofed message
Thu 2018-04-19 10:49:45.302:  --> QUIT
The ISP thinks that since the sender is the same as the recipient on their domain, it is SPAM and they are rejecting it.