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iOS 7 and sending emails larger than 40KB from Exchange accounts

Posted on 2013-11-19
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Last Modified: 2013-11-30
The Server enviroment is SBS 2008,
Exchange 2007, IIS 7. My end users with the latest iphone IOS 7 are intermittenly having issues sending or forwarding emails. The message they see implies that the message is to large. This can occur even with a txt only message, (no attachments)
I've seen apple forums pointing at the exchange server as the problem, stating that the
setting in IIS for  UploadReadAheadSize setting should be increased.
I'm not having this issue with any Android devices or Apple devices before IOS 7.. Has anyone else seen this and found a solution to this ?
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Question by:hounschell
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Expert Comment

by:Nick Rhode
ID: 39659950
This resolved it for me

http://social.technet.microsoft.com/Forums/exchange/en-US/52f58b47-b95e-4f44-bb4e-6bd8b1b4eb94/iphone-sending-attachment-problems 

Even though this is for attachments it still applies to the read heads which was my problem (48kb limit).  Ironically I did not have this problem until iOS 7
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Accepted Solution

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hounschell earned 0 total points
ID: 39663057
Thanks Nrode,

I applied these two commands and restarted IIS and will test over the next couple of days to see if the issue is solved...

With the following command you can change the value (in this case 10MB):
 C:\Windows\System32\inetsrv\appcmd.exe set config -section:system.webServer/serverRuntime /uploadReadAheadSize:"10485760" /commit:apphost
 
C:\Windows\System32\inetsrv\appcmd.exe set config "Default Web Site" -section:system.webServer/serverRuntime /uploadReadAheadSize:"10485760" /commit:apphost
 
jerry
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Author Closing Comment

by:hounschell
ID: 39686662
So far so good...
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