Package: opendkim
Version: 2.9.2-2
I'm using OpenDKIM and Postfix on Debian
Outlook 365 and Hotmail users regularly have trouble receiving email
from some of the sending domains.
One Outlook 365 user checked with their IT helpdesk and they sent me a
copy of the message headers. In some of the messages they receive, it
has something like:
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=example.net; s=mail;
t=1467730175; bh=......;
h=Subject:To:References:From:Date:In-Reply-To:From;
b=........=
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=example.net; s=mail;
t=1467730151; bh=(matches the previous message);
h=Subject:To:References:From:Date:In-Reply-To:From;
b=(doesn't match the previous header)
Authentication-Results: spf=pass (sender IP is 195.8.117.5)
smtp.mailfrom=example.net; example.org; dkim=fail (body hash did
not verify) header.d=example.net;example.org; dmarc=bestguesspass
action=none header.from=example.net;example.org; dkim=fail (body
hash did not verify) header.d=example.net;
X-DkimResult-Test: Failed
Subject: This email has been identified as potential SPAM. Please
verify. (original subject follows.....)
I notice that the DKIM-Signature header is repeated with different
values for "b=..." and "t=" while all other values appear the same.
Are there known issues with OpenDKIM? Is there any way to add any debug
headers to the message to help troubleshoot?
