On Tue, 15 Nov 2016, Terry Barnum wrote:

>If we send email to a specific gmail user we receive a bounce from Hotmail 
>saying it can't deliver due to our DMARC policy. Postfix logs show the email 
>being delivered and accepted by gmail. Email to other gmail users goes through 
>fine.

If you get a bounce from Hotmail for a message you delivered to Gmail I 
would bet the Gmail user has forwarding enabled but Gmail didn't do any 
header rewrites.  Maybe they should (always is safer than only when SPF 
and/or DMARC results make it a certainty) or like others they could do 
away with forwarding in favor of having the destination fetch from them.


/mark

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