I'm receiving the following message:
The following recipient(s) could not be reached:
'firstname.lastname@example.org' on 6/18/2008 11:50 AM
550 No such domain at this location (email@example.com)
We host the e-mail and domain of the user that's having this problem.
Everyone except user 1 on this domain can send to anyone just fine.
User 1 can send within her own domain but cannot send to anyone outside of her domain.
We also have a Barracuda Spam Firewall. I've added user 1's e-mail address to whitelist and valid domain recipients. This is what we do for each user.
The Barracuda logs the emails as Invalid Recipient and doesn't send them.
Can anyone help me?