[ILUG] SPF and backup MX servers

[Justin Mason]

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Scott Wunsch writes:
>On Fri, 09-Jan-2004 at 11:46:08 -0000, Kenn Humborg wrote:
>
>> With all the hoopla recently about SPF (sender permitted from)
>> records, there is one thing that I still have doubts about:
>> backup MX servers.
>
>That's nothing.  What about a user who has an email address
>user at example.com, and then moves over to the foo.com domain, and sets up
>mail forwarding from user at example.com to user at foo.com?
>
>Now user1 at sender.com sends an email to user at example.com, which is accepted
>by the server for example.com (say, mail.example.com).  Now
>mail.example.com forwards the mail on to the foo.com server for
>user at foo.com.  But the foo.com server does an SPF check for sender.com, and
>sees that mail.example.com isn't permitted, and rejects the message.  Oops?

.forward on mail.example.com:

"| /usr/sbin/sendmail -oi user at foo.com"

Problem solved.

- --j.
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