Signature from a particular email provider failing

From: feisar <f3isar_at_googlemail.com>
Date: Sun, 23 May 2010 00:03:34 +0100

Hi, I recently set up OpenDKIM 2.0.4 with Postfix 2.3.3 and would be
really grateful if someone could help shed some light on an issue I am
having...

Mail from my server is signed. Googlemail, Yahoo and port25[dot]com
all successfully verify it. Mail that has a DKIM signature coming into
my server is checked and both Googlemail and Yahoo verify no problems.

Here's the strange thing. Mail from the email provider
Bluebottle[dot]com verifies fine if it's sent to one recipient on my
server, however, it fails if it is sent to two or more recipients:

1.
opendkim[14659]: (unknown-jobid) mi1.bluebottle[dot]com [ipaddress] not internal
opendkim[14659]: (unknown-jobid) not authenticated
opendkim[14659]: 28ECB3F16 DKIM verification successful

2.
opendkim[14659]: (unknown-jobid) mi0.bluebottle[dot]com [ipaddress] not internal
opendkim[14659]: (unknown-jobid) not authenticated
opendkim[14659]: (unknown-jobid) mi0.bluebottle[dot]com [ipaddress] not internal
opendkim[14659]: (unknown-jobid) not authenticated
opendkim[14659]: 39C653F92 SSL error:04077068:rsa
routines:RSA_verify:bad signature
opendkim[14659]: 39C653F92: bad signature data
opendkim[14659]: 37D583F16 SSL error:04077068:rsa
routines:RSA_verify:bad signature
opendkim[14659]: 37D583F16: bad signature data

I have access to a Bluebottle account and have sent an email to the
automatic tester at port25[dot]com. The result is that it passes DKIM
but fails DK ('Result: fail (bad signature)'. I did not enable
'--with-domainkeys' when compiling so that shouldn't matter but could
it be an issue?

Thanks.
Received on Sat May 22 2010 - 23:03:49 PST