Hi all,

I have a 2013 environment with MDM also in place. Just recently all mobile devices (iOS, Android, Windows OS) have stopped being able to reply or forward to emails on their mobile device. Nothing has changed in the environment that I'm aware of. The main factors are listed below.

- OWA and Outlook access is functioning as normal.

- Users can send and receive on their mobile device

- When they try to reply or forward it fails with 'Cannot Send Mail. The message was rejected by the server'.

- The user can then go into their Outbox and successfully send the email from there.

- The issue is affecting SmartForward and SmartReply commands but not the SendMail command.

Within OWA I have recorded some logs using Settings -> Options -> Phone -> Start Logging 

Within the logs the error/exception is as below.

Command_WorkerThread_Exception : 
--- Exception start ---
Exception type: System.ArgumentNullException
Exception message: Value cannot be null.
Parameter name: SubjectPrefix
Exception level: 0
Exception stack trace:    at Microsoft.Exchange.Data.Storage.StorePropertyDefinition.Set(ExchangeOperationContext operationContext, BasicPropertyStore propertyBag, Object value)
   at Microsoft.Exchange.Data.Storage.PropertyBag.SetProperty(StorePropertyDefinition propertyDefinition, Object value)
   at Microsoft.Exchange.Data.Storage.PropertyBag.SetProperty(PropertyDefinition propertyDefinition, Object value)
   at Microsoft.Exchange.Data.Storage.ReplyCreation.BuildSubject()
   at Microsoft.Exchange.Data.Storage.Item.InternalCreateReply(MailboxSession session, StoreId parentFolderId, ReplyForwardConfiguration configuration)
   at Microsoft.Exchange.Data.Storage.MessageItem.CreateReply(MailboxSession session, StoreId parentFolderId, ReplyForwardConfiguration configuration)
   at Microsoft.Exchange.AirSync.SmartReplyCommand.ExecuteCommand()
   at Microsoft.Exchange.AirSync.Command.WorkerThread()
--- Exception end ---

This appears to indicate there's an issue with the subject prefix being Null. However the issue occurs when emails have a subject and using transport rules I've set some test emails to prepend a subject to each email but that has not helped. 

I've done quite a bit of searching online but can't find anything really that matches what I'm seeing.

Has anyone experienced  something similar before? Any help would be greatly appreciated :) 

bitzi_f

• Edited by bitzi_f Monday, February 02, 2015 3:33 AM

Hi there, I've hit the same situation today, about 30 users affected. Seems this issue is still pending. Anyone can please help out, thanks.