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550 No such user - 5.Jun.2006 7:02:50 PM   


Posts: 1
Joined: 5.Jun.2006
Status: offline

Occasionally I have users who contact me about the following error occuring when they send to internal users.

550 No such user (insert username or groupname) Cached lookup 

I have resolved this error buy changing their Exchange client to the first or primary account on their Outlook clients.  Each user has 2 accounts, one account for Internal which is the Exchange account, and one account for external mail (pop3) this is another server not on our network.

I have a similar problem occuring at the same time when a user tries to send to an internal group, they will get the same 550 error.  However if they expand the groupname and send to each individual user the mail goes thru.

Suggestions as to identify and elminate this error would be appreciated.
Post #: 1
RE: 550 No such user - 6.Jun.2006 10:25:46 AM   


Posts: 1019
Joined: 25.Sep.2003
From: York, UK
Status: offline
550 looks a bit like an SMTP error rather than an Exchange error - which would suggest that the clients are trying the second profile (an ISP account, perhaps?) rather than the internal Exchange server profile.

I'm curious why you'd have all your clients with multiple profiles - how complicated is this?  And difficult for your users as well.  Much better to have everything handled by Exchange, with an IMS to talk SMTP to the Internet.  This is how Exchange is designed to work.

(in reply to wesr)
Post #: 2
RE: 550 No such user - 14.Jun.2006 4:38:25 PM   


Posts: 1
Joined: 14.Jun.2006
Status: offline
I'm having the same problem.

The reason I have two profiles was that the previous admin did not have an exchange server and we only used our domain email (pop3) as our means of communication.

Exchange was brought in at a later date and for primarily calendar use and internal colaboration.  Not sure why smtp wasnt incorporated in to Exchange 5.5.  2003 is on the menu but not untill next budget.

Regardless of that fact, I'd like some insight to this problem as well. 

(in reply to zbnet)
Post #: 3
RE: 550 No such user - 20.Jun.2006 5:12:55 PM   


Posts: 1019
Joined: 25.Sep.2003
From: York, UK
Status: offline
My insight into your problem is that you are trying to use the software in a way that it isn't designed for.  That's why you're having problems.

Install an IMS, and ask your ISP to deliver your email via SMTP to your Exchange server - then all your client profile problems will disappear.

(in reply to mltnetadmin)
Post #: 4

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