Barracuda Delivery Solution
This article is for customers using Barracuda as an incoming gateway and are having issues receiving email from SMTP2GO.
1 - Remove the SMTP2GO IP address(es) from the "Trusted Forwarders" list - if it has been added.
2 - Add the SMTP2GO IP address(es) to the IP Exemption list. You can find this in the "Block/Accept" tab followed by the "IP Block/Exempt" option.
If you're not using dedicated IP address(es), you can find a list of addresses to add to the IP Exemption list in this support article.