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550 Rejected by header based Anti-Spoofing policy


 

Hello

I have a member who have/had some e-mail problems that I'm still in the process of sorting out.

The member is currently subscribed with two e-mail addresses, say, user@... and user@.... When I visit the message history of both these accounts, I see a bounce notice (although oddly I don't see this bounce mentioned in the group's history):

For account user@...:

Recent Bounces
When Message Reason
Mar 28 [message title] 550 Rejected by header based Anti-Spoofing policy: user@... - [6lDVz9szPvqv-XYAnfANkQ.za31]

For account user@...:

Recent Bounces
When Message Reason
Mar 28 [message title] 550 Rejected by header based Anti-Spoofing policy: user@... - [Md2vVsKuMW6C1h0uPf43KA.za82]

What I find odd is that both bounce messages refer to user@.... In other words, a message that was sent to user@... triggered a bounce message that mentions user@.... (The code at the end of the message is also different, I assume it's a reference number.)

Can anyone shed some light on this?

(This member was subscribed to the Yahoogroup using both e-mail addresses, with one of them set to no-mail, and this had something to do with forwarding of mails within their company, so that the user thinks he's using e-mail address X whereas in fact his e-mails' headers say he's using e-mail address Y, or something like that.)

Thanks
Samuel

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