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Slow Incoming Mail with Attachments - Exchange 2013

Last Modified: 2015-03-15
Hi All,

Hope somebody could help me on this!

We have a strange problem with our Exchange server. Currently running Eachange 2013 with all roles enabled on single server.

Port Re-Direct and Reflector Service is been used from www.noip.com.

Mail Flow incoming is:-

Sender -->> No IP -->> Our Exchange Server

NO IP are saying everything is OK there side.

When a user sends an e-mail with no attachment delivery time is approx 30 seconds. When the same user sens with an attachement (even 500kb) delivery time is sometime 2+ hours.

Im no Exchange GURU so dont even know where to start looking.

As part of fault finding so far:

Server is Windows 2008 R2 (64 Bit), Fully Patch
Exchange Fully Patched
Mail Filter Disabled on Exchange

Server Specs are:- , 8 Gig RAM, only 5 Gig Used. Running on ESXi. 12 Mailbox's currently on there.

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