Sender Rewrite Scheme for Email Forwarding
Apparently the typical email forwarding service's process breaks SPF (»www.openspf.org/FAQ/Forwarding). I have spent the last month trying to find an inexpensive shared hosting provider that will support SRS. I have found none.
I needed reliable email service with SPF, DKIM and servers that are not on black lists. All shared hosts will have problems keeping their servers off black lists (I understand that) but I do know that most of the reputable ones will at least try to get it off the list if you tell them it's on a list.
I ended up going with a true email hosting company (email is their only business) and they provide everything I need for a great price. So I'm happy now, but I just don't understand why nobody supports SRS?