[AUTORESPONSE] messages fails DKIM

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Joined: Fri Jun 02, 2017 6:00 pm

[AUTORESPONSE] messages fails DKIM

Postby MartyScIV » Mon Dec 04, 2017 6:52 pm

It was brought to my attention that emails sent due to an enabled Auto Response setting (used for automating OOF replies) were going into Gmail's Spam folder. These were set up using the MailEnable Web interface. Emails sent directly to a Gmail address correctly appeared in the inbox--same account. After duplicating this issue using my account, I looked at the header of both a successful email and an unsuccessful email. Turns out that the email sent from the auto responder failed DKIM and therefore was put into the spam folder. I'm not sure how MailEnable is sending these auto response emails.

Below is an SMTP header relating to DKIM from an email sent manually to a Gmail address:

Authentication-Results: mx.google.com;
dkim=pass header.i=@lno.io header.s=MESelector header.b=fnSFFnB+;
spf=pass (google.com: domain of martys@lno.io designates as permitted sender) smtp.mailfrom=martys@lno.io;
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=lno.io
dkim-signature: v=1; c=relaxed/relaxed; h=from:to:subject:date:message-id:mime-version:content-type:reply-to; d=lno.io; s=MESelector; a=rsa-sha1; bh=[redacted]

and here is the same section on an auto response email that fails DKIM:

Authentication-Results: mx.google.com;
dkim=neutral (body hash did not verify) header.i=@lno.io header.s=MESelector header.b=MRGp5RES;
spf=pass (google.com: best guess record for domain of postmaster@smtpout.learnnowonline.com designates as permitted sender) smtp.helo=smtpout.learnnowonline.com;
dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=lno.io
dkim-signature: v=1; c=relaxed/relaxed; h=to:date:message-id:content-type:content-transfer-encoding:from:subject:reply-to; d=lno.io; s=MESelector; a=rsa-sha1; bh=[redacted]

Both of these emails should be coming from the same server with the same IP address. Is there a place to configure how auto responses behave?


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