Is there something that at a firewall level that is masking and rewriting their domain name as it leaves the network. I know a lot of spam appliances and firewalls can do this.
If they send to internal recipients and double click on their name and that email address is not listed then you have something rewriting it other than exchange. From: Benjamin Zachary - Lists [mailto:[email protected]] Sent: Friday, May 15, 2009 1:40 PM To: NT System Admin Issues Subject: Outlook/Exchange oddity I have a client who has exchange 2003 in a datacenter. They are in a remote location with outlook with pop3/imap variants. So whenever they submit an email from their outlook it comes through as [email protected] however if you goto webmail its [email protected]. Whats happening is Im getting DNS LOOKUP FAILURE 5.5.0 on their Outlook. The thing is I cant find out why their outlook is 'converting' their email address. I checked Exchaneg Recipents and everything seems okay and the email address is just right in the user in AD. ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
