Receiving 550 bouncebacks for one user. How do I fix this?
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.