Contact 4Help by using the Help Request Form or by calling (540) 231-HELP (4357). Explain that you are receiving an error message stating that the domain is blacklisted when you send messages to or receive messages from a VT Google Apps Mail account.
The domain or IP address either from which or through which you send mail may be blocked from sending or receiving messages to VT Google Apps Mail addresses.
For advanced users:
The following is an example of the full error message:
Example: A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: email@example.com SMTP error from remote mailer after MAIL FROM:
There are two solutions you can try: