FWIW, I've told my hosting customers that Forwarding as a reliable function
is effectively dead and should be avoided, for all of the reasons you are
dealing with.
If an email really does need to be "forwarded", I've advised my customers
to copy the email to the clipboard and paste it into a new email to the
intended recipient (what would have been the forwardee).
Forwarding emails manually, using a mail client, isn't broken. This still
works fine, as the sender/From address will pass SPF. Clicking the
"forward" button in your email client creates a brand new message, with you
as the sender. No need to copy-and-paste the text :)
Forwarding emails to a different domain at the server, without human
intervention, often fails because SPF checks fail. This is because the
sender/From address is not modified. If the server implements SRS (Sender
Rewriting Scheme) then forwarding mail to a different domain does work, as
the server HAS changed the sender/From address, and SPF test pass.
Anthony
--
www.fonant.com - Quality web sites
Tel. 01903 867 810
Fonant Ltd is registered in England and Wales, company No. 7006596
Registered office: 31 Greentrees Crescent, Sompting, BN15 9SY
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