RE: Is it possible to force the d= part in the DKIM-Signature: header?

From: Murray S. Kucherawy <>
Date: Wed, 29 Jun 2011 10:51:00 -0700

> -----Original Message-----
> From: [] On Behalf Of Luke
> Sent: Wednesday, June 29, 2011 9:04 AM
> To:
> Subject: Is it possible to force the d= part in the DKIM-Signature: header?
> Hi there,
> I was wondering if it's possible to always set
> I don't know if this is the best solution but I'll briefly explain the
> setup.
> We have many different sites on many domains, we aren't using our own
> mail for mailing lists etc, we use a third party provider for that.
> But for notification emails (signup, lost password, etc) we use our
> own postfix relay server.
> I've recently set this up (before each server was using their own
> default sendmail and of course getting blacklisted on spam sites for
> localhost.localdomain) now everything seems to be working nicely.
> As we are acting as our own third party relay server of sorts instead
> of setting up the TXT record for every domain i thought it would be
> nice if we could sign it as the relay server itself.
> I can get it to sign if i send from "" but if i send from
> "" it wont sign (but I don't mind if it is signed from a
> different domain)

A copy of your current configuration file(s) would be helpful, but basically the SigningTable and KeyTable together can produce the effect you want. See opendkim/README and the opendkim.conf(5) man page. If you still have questions, you're welcome to follow up here.
Received on Wed Jun 29 2011 - 17:51:08 PST

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