Hello all we have been facing some odd issue lately in our messaging environment. 

for example when you use username@acceptedDomain.com email on an iPhone and iOS devices. Minutes after setting up the account the email address gets changed to username@RegularCorporateDomain.com. After it does this, any mail replies you send put another copy in the users inbox. 

past couple of months this has been happening a lot. 

Can anyone know what might be the issue. 

We tried the workaround from this article https://support.microsoft.com/en-us/kb/3012580 and the users says it worked and they no longer have the issue. But i wana know if anyone else is having the same issue and what do you guys think of a permanent resolution. is it an exchange/Microsoft issue or IOS issue 

The permanent resolution per the KB article you quote is:

To resolve this problem in Exchange Server 2013 or Exchange Server 2010, install one of the following updates:

• Cumulative Update 8 for Exchange Server 2013       (http://support.microsoft.com/kb/3030080)    
• Update Rollup 9 for Exchange Server 2010 Service Pack 3

I read that too and know it. Just wanted to see if anyone else have faced such issue and if that update is been done before. 

Hello Riaz,

Yes, this works on one of my customer. Please schedule a downtime and apply the latest update.

• Edited by Simon_WuMicrosoft contingent staff, Moderator 35 minutes ago abcd