Outlook 2016, Large Attachments and Activesync
Problem reported by Brian Ebers - May 13, 2016 at 9:47 AM
Submitted
Smartermail Enterprise Version 14.5.5871.   An end user of mine is trying to send a large attachment about 20MB via Outlook 2016 connected to SM via ActiveSync account.    It never sends, waited at least 5 minutes just sits in Outbox.  The user has an IMAP account on the same server with a different domain and it sends just fine though it takes a minute or two, same Outlook 2016 installation just a different account.  I understand the IMAP account is sending out via SMTP first and the message eventually syncs to server SENT box after leaving the local outbox.
 
Am I hitting a protocol limitation here or do I have my hopes too high for the ActiveSync account type.  I know the standard answer is "IMAP" is the best account type for Outlook but looking for any ideas or comments.  Thanks in advance.

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Scott Carullo Replied
Any word on this? It appears to be a smartermail issue.
 
Outlook 2013, Outlook 2016, And EMClient all have the same issue with sending attachments >20MB. Suspect phone mail clients are also effected, I just haven't been able to find a client that allows me to attach more then 20MB worth of attachments.
 
I've ensured that attachment sizes are all high. And can send via SMTP and webmail with no issue. 
1
Rod Lasky Replied
Employee Post
Hello.  Outlook 2013/2016 have their own built-in maximum attachment size of 20Mb.  If you wish to increase that limit, you would need to add a registry entry per this Microsoft KB Article.  I hope this helps.  
Rod Lasky
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com

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