[Ubuntu] Zimbra mail delayed?

[CarolBooth]

Encountering occasional weirdness with Zimbra using web access. The following message arrived at 03:09 but did not appear on my screen until 11am. Other messages arrived as expected in the meantime. Can anyone explain this for me?

Carol

Message (internal information replaced in CAPS)

Return-Path: MY EMAIL ADDRESS
Received: from zimbra.OUR.DOMAIN (LHLO zimbra.OUR.DOMAIN)
([SERVER_IP][SERVER_IP].[SERVER_IP].[SERVER_IP].[SERVER_IP][SERVER_IP]3) by zimbra.OUR.DOMAIN with LMTP; Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP]
[SERVER_IP]3:[SERVER_IP]9:[SERVER_IP]4 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP] (GMT)
Received: from localhost (localhost.OUR.DOMAIN [[SERVER_IP]27.[SERVER_IP].[SERVER_IP].[SERVER_IP]])
by zimbra.OUR.DOMAIN (Postfix) with ESMTP id A[SERVER_IP]BE48[SERVER_IP]E3CB
for <email address>; Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP] [SERVER_IP]3:[SERVER_IP]9:[SERVER_IP]4 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP] (GMT)
X-Virus-Scanned: amavisd-new at zimbra.wolsinghamschool.net
X-Spam-Flag: NO
X-Spam-Score: -2.[SERVER_IP][SERVER_IP]4
X-Spam-Level:
X-Spam-Status: No, score=-2.[SERVER_IP][SERVER_IP]4 tagged_above=-[SERVER_IP][SERVER_IP] required=6.6
tests=[ALL_TRUSTED=-[SERVER_IP].8, AWL=-[SERVER_IP].9[SERVER_IP]3, BAYES_[SERVER_IP][SERVER_IP]=-2.599,
FH_DATE_PAST_2[SERVER_IP]XX=3.[SERVER_IP]88] autolearn=no
Received: from zimbra.OUR.DOMAIN ([[SERVER_IP]27.[SERVER_IP].[SERVER_IP].[SERVER_IP]])
by localhost (zimbra.OUR.DOMAIN [[SERVER_IP]27.[SERVER_IP].[SERVER_IP].[SERVER_IP]]) (amavisd-new, port [SERVER_IP][SERVER_IP][SERVER_IP]24)
with ESMTP id OY8qoY5-nil3 for <email address>;
Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP] [SERVER_IP]3:[SERVER_IP]9:[SERVER_IP]4 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP] (GMT)
Received: from Moodleserver[SERVER_IP].local (moodle.wolsinghamschool.net [[SERVER_IP][SERVER_IP].[SERVER_IP].[SERVER_IP].4[SERVER_IP]])
by zimbra.OUR.DOMAIN (Postfix) with ESMTP id [SERVER_IP]947D8[SERVER_IP]E3[SERVER_IP]F
for <email address>; Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP] [SERVER_IP]3:[SERVER_IP]9:[SERVER_IP]4 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP] (GMT)
Received: by Moodleserver[SERVER_IP].local (Postfix, from userid 33)
id E7942[SERVER_IP]C34[SERVER_IP]C9; Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP] [SERVER_IP]3:[SERVER_IP]8:49 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP] (GMT)
To: MY EMAIL ADDRESS
Subject: WolsiWeb: [ERROR] Scheduled backup status
Date: Thu, 4 Feb 2[SERVER_IP][SERVER_IP][SERVER_IP] [SERVER_IP]3:[SERVER_IP]8:49 +[SERVER_IP][SERVER_IP][SERVER_IP][SERVER_IP]
From: "Carol Booth" <email address>
Message-ID: <ba6f65f4e4b67f88[SERVER_IP]8b[SERVER_IP]a72c46abc474@localhost>
X-Priority: [SERVER_IP]
X-Mailer: PHPMailer [version Moodle 2[SERVER_IP][SERVER_IP]7[SERVER_IP][SERVER_IP][SERVER_IP]57[SERVER_IP]]
MIME-Version: [SERVER_IP].[SERVER_IP]
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="UTF-8"

[webman]

It looks like the times and dates have been replaced with [SERVER_IP] as well

You will be able to find more info in the file /var/log/mail.log (or mail.log.0, ..log.1 for further back in time). Filter it for all the message IDs in the email like this (example):

cat /var/log/mail.log | grep -e A0BE480E3CB -e 0947D80E30F -e ..........

To find the message IDs, look for the lines that say by hostname.example.com (Postfix) with ESMTP id B0A83BE276.