Exim misses delivery

[Serra]

I'm having a bit of an issue. Exim missed a delivery, here is the log:

[email protected] [~]# grep 1VjKdF-0005Mw-PR /var/log/exim_mainlog
2013-11-20 21:08:41 1VjKdF-0005Mw-PR <= [email protected] H=nm26.bullet.mail.ne1.yahoo.com [98.138.90.89]:44498 P=esmtps X=TLSv1:DHE-RSA-AES256-SHA:256 S=34076 [email protected] T="Re: Niox Charge" for [email protected]
2013-11-20 21:08:44 cwd=/var/spool/MailScanner/incoming/15842 5 args: /usr/sbin/exim -C /etc/exim_outgoing.conf -Mc 1VjKdF-0005Mw-PR
2013-11-20 21:08:44 1VjKdF-0005Mw-PR => tonyap <[email protected]> R=virtual_user T=virtual_userdelivery
2013-11-20 21:08:44 1VjKdF-0005Mw-PR Completed

However, he is the actual email 1VjKdF-0005Mw-PR

Date: Wed, 20 Nov 2013 19:08:39 -0800 (PST)
From: sender <[email protected]>
Reply-To: sender <[email protected]>
Subject: Re: Niox Charge
To: person <[email protected]>,
'Tonya P' <[email protected]>,
'Other guy' <[email protected]>
In-Reply-To: <[email protected]>

Exim totally skipped [email protected]. I noticed that 'person' didn't have single quotes around it, but testing showed that made no difference.

I see no reason why it wouldn't be delivered. Any idea what could have happened?

Also several other email, one right before and right after this one were from the same yahoo user using the same distribution list and all went well.

 

[cPanelMichael]

Hello

It looks like you are using the MailScanner application. This is a third-party application that is not supported by cPanel. Could you temporarily disable MailScanner to see if the issue continues so you can rule out MailScanner as the cause of the issue?

Thank you.

 

[Serra]

Disabling Mailscanner isn't a realistic option since we can't reproduce the issue with or without Mailscanner. Emails from the same user to the same users worked fine, within an hour of that email.

I'll look at Mailscanner as a possible cause.