From: Wietse Venema (wietseporcupine.org)
Date: Mon Dec 01 2008 - 21:16:32 CST

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David Jonas:
> We provide forwarding to external accounts (e.g. gmail.com) and it
> appears that in some cases postfix is invalidating the DKIM signatures.
> The most prominent and obvious case is eBay and PayPal where gmail is
> now bouncing/dropping messages where the signature doesn't match.
>
> I caused ebay to send an email to a gmail address and then to an address
> that forwards. Doing a diff between the messages show this:
>
> # diff -u ebay-fail.txt ebay-pass.txt
> ...
> -92,6 +83,7
> Designated trademarks and brands are the property of their respective
> owner=
> s.
> eBay and the eBay logo are registered trademarks or trademarks of eBay,
> Inc=
> -=20
> +.=20
> eBay is located at 2145 Hamilton Avenue, San Jose, CA 95125.
>
> Adding a "." to that line in the version that doesn't verify causes the
> message to verify.
>
> Is there something I can do to keep postfix from altering this? Am I

What evidence do you have that Postfix changes this, as opposed
to something else?

        Wietse

> barking up the right tree, or should I be verifying these and resigning
> them? Should I just tell my customers, "tough luck, use your gmail
> account directly?"
>
> Any help is appreciated.
>
> David
>
>
>
>

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