View Full Version : Outlook 2007 - "501 #5.1.1 bad address" Message

Chemical Ali
19-01-2007, 08:55 PM

I'm trialling Office 2007 (120 day trial). In Outlook I can receive messages okay but whenever I reply to a message or send a new one I get the following error message on an undeliverable 'system administrator' message:
501 #5.1.1 bad address

The addresses I'm e-mailing are all okay so I can't figure it out.

Does anyone know?



20-01-2007, 11:49 AM
It could be one of a hundred things.......


Chemical Ali
22-01-2007, 09:10 AM
Yeah I came to the same conclusion after 'googling' as well which is why I posted to this forum in case anyone else had come across it whiile using Outlook 2007.

Any other suggestions/advice?

Thanks in advance!

Chemical Ali
22-01-2007, 07:52 PM

Speedy Gonzales
22-01-2007, 07:58 PM
You should really see if you ISP has a newsgroups server, so u can check them out and post questions.

I've posted your ? in an Outlook newsgroup. I'll post any answers I get back here.

Chemical Ali
22-01-2007, 08:05 PM
I did and they had nothing there.
Thanks for the assistance -- it's really weird eh -- never ever had this problem before.



Speedy Gonzales
23-01-2007, 08:58 AM
Got a reply saying:

Does the person have their outgoing mail server setup correctly in their
mail account?

Chemical Ali
25-01-2007, 11:04 AM
Yes I do -- one of the 1st things I checked.
Any other suggestions?

13-02-2008, 08:08 PM
I'm guessing you've found the problem and fixed it. I came across the same problem when I rebuilt my laptop. I beileve the cause of the error (for me at least) was installing McAfee Security Centre. When I saw the post above advising to check the outbound mail server set up I did just that and found the smtp settings had changed and now started with mail. instead of smtp. I changed it back to smtp. and what do you know it works just fine.