I just had a bounce, when a member of the list posted, from what is
presumably a mimecast served company, to one of my club lists.
The member's own copy of the list posting was bounced by his provider
with
550 Rejected by header based Anti-Spoofing policy:
[member's address redacted] -
https://community.mimecast.com/docs/DOC-1369#550 [_gg8dmJZP_u-QdQxhMDwLg.uk114]
I suppose that this means they don't accept a message "From:" an
address they serve - but the message was DKIM-signed by the company my
member sent from, so they should know it's not a spoof! (And my list
is DKIM-clean.)
What should they be doing according to "best practice"?
Julian.
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