Issue receiving email from Office365 to any of our Smartermail servers
Problem reported by adam - December 20, 2016 at 8:52 PM
We have two Smartermail server. Both are hosted in different datacenters and are different Smartermail versions.Starting about a week or 2 ago, emails coming from Office365 hosted accounts get delayed when sending to any domain on either of our servers. We have done a message trace on an Office365 account and it reports pending because the server blocked the connection or socket error. (0% of the time the message will go through after future retries by the Exchange server but it could be hours or days. About 10% fail do to time out. We have tickets open with Microsoft but they have not been very responsive. We have all the listed IPs from Microsoft added to our whitelist and that doesn't make a difference. Is anyone else having an issue or have any idea? We have been struggling for days and have hundreds of upset clients thinking its us.
Any help would be appreciated!
Note: We have no issues receiving email from any other service provider (i.e. Self hosted, gmail, yahoo, etc).

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Richard Frank Replied
I just checked mailing from my account to an account on my server and accoording to the header it took just seconds.

Received: from ( []) by with SMTP
cipher=Aes bits=256);
Wed, 21 Dec 2016 10:40:22 +0100
Received: from ([]) by over TLS secured channel with Microsoft SMTPSVC(7.5.7601.23008);
Wed, 21 Dec 2016 01:40:17 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;;
s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version;

good luck.
0 Replied
Hi Adam,

What version's of Smartermail are you running?

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