Does SPF break email forwarding?
Stuart Gathman’s opinion is recorded at http://archives.listbox.com/spf-discuss@v2.listbox.com/200410/0488.html. Yes, it does. You’ll have to switch from forwarding, where the envelope sender is preserved, to remailing, where the envelope sender is changed. But don’t worry, we’re working on providing SRS patches for the four major opensource MTAs, so that when you upgrade to an SPF-aware version, this problem will be solved also. If your forwarding runs through a commercial service like pobox.com, you shouldn’t have to do anything. They have to change with the times, and perform the above rewriting automatically for you. SRS is a structured standard that helps them adapt. Until the SRS patches are ready, the following workarounds will preserve the important functionality.
