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New Contributor
Posts: 2
Registered: ‎04-26-2008
My Device: Not Specified

Delivery Status Notification (Failure)‏

I have an older 7250 BB.  Ever since I received an email telling me congrats on setting up my account on 4/19/08 (I've had the same account for over 5 yrs) I cannot email one of my contacts that I was able to for years before this happened. 


The reason for the problem:
5.1.0 - Unknown address error 501-"#5.1.3 Invalid character ('!') in username."


There, of course, is no Invalid character in the user's name.  Anyone have any suggestions? Only thing different with this specific email address is it has under-scores in it. 



Posts: 16
Registered: ‎04-16-2008
My Device: Curve 8330

Re: Delivery Status Notification (Failure)‏

Sorry to hear you're having problems.  One thing you can definitely do to try and resolve the issue is log into your BIS account and resend your service books, which resolves most issues.  If you're a BES client(your IT guy takes care of your blackberry or on an Exchange server), have your IT guy do this.


Good luck.

-- Lonnie (aka javatyger)
New Contributor
Posts: 2
Registered: ‎04-26-2008
My Device: Not Specified

Re: Delivery Status Notification (Failure)‏

Thank you for the rely.  It's just my personal bb so I really have no one to work on it.  I may contact my carrier and see if they have a clue. 



Super Contributor
Posts: 257
Registered: ‎05-02-2008
My Device: BB 8530/ OS
My Carrier: Verizon

Re: Delivery Status Notification (Failure)‏

I know this sounds crazy but I have seen that before when I sent a text message to someone who's # was temp. suspended. Maybe the email address no longer exists? Just a thought.
Intellectuals solve problems; geniuses prevent them.
-- Albert Einstein
Trusted Contributor
Posts: 111
Registered: ‎04-08-2011
My Device: BlackBerry PlayBook

Re: Delivery Status Notification (Failure)‏

Hello, I was wondering if you had any update on the resolution of the error message 

5.1.0 - Unknown address error 501-"#5.1.3 Invalid character ('!') in username.?


I am getting this error message as well.