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[wmehl]

In our work to get IP's Return Path certified, RP has asked that we sign both DKIM and DK. We started out setting DKIM and DK yes at a VMTA level as needed.

At a global level, we used DKIM as default and DK as the exception, but not both. I flipped the switch last night, global settings are both DKIM and DK, with domain level exceptions. We will see how this goes...

[CaLViN]

Wayne,
We sign ALL emails going out of the server with both protocols(DKIM and DK).

[daniel]

There is a thread in the forums here though with recommended settings on which ISPs to use which authentication methods.

The assumption is that it is resource consuming and possibly a drawback as far as deliverability if you send headers that aren't looked at by some ISPs or mail user agents.

[CaLViN]

There is a thread in the forums here though with recommended settings on which ISPs to use which authentication methods.

The assumption is that it is resource consuming and possibly a drawback as far as deliverability if you send headers that aren't looked at by some ISPs or mail user agents.

Yep,it might consume some resources but it is always a PLUS,right ?