UPN and POP3 Errors on Exchange 2007

Saw this little blurb in Redmond Magazine and thought I’d pass it on.

If using Exchange 2007’s POP3 service, errors can occure if a UPN (username@domain.com) exceeds 40 characters. 40 characters is the default limit for POP3 as set by the MaxCommandSize setting.

To allow more than 40 character UPN names when using POP3:

1. Open the Exchange Management Shell
2. To review the current POP3 settings, type Get-POPSettings and you’ll see the value for MaxCommandSize among others
3. To increase to 100, type Set-POPSettings -MaxCommandSize 100
4. Restart the POP3 for the changes to take effect.

1 Comment

Filed under Microsoft, Windows Server

One response to “UPN and POP3 Errors on Exchange 2007

  1. To my humble opinion one of the worst troubles is MS Exchange's problems. Because of I had nearly some dozens problems. Fortunately several days ago I came across one software, which might solve this problem not worse than mine – fix microsoft exchange.

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