I have some forwarders setup on my server that go from firstname.lastname@example.org to email@example.com. When mail comes in from firstname.lastname@example.org (or AOL) to email@example.com and then forwarded, the Comcast email servers reject it with dmarc policy. I know this is because the from address is yahoo and yahoo tells Comcast to reject it if it did not come from a yahoo server. Is there a work around for this? Could I change the forwarder to change the sender address to the forwarder address for only @yahoo etc addresses? The sender address would be unknown. Yahoo stinks with this policy of theirs.