Thank you for your question. Depending how the emails are being sent/received, sometimes forwarders can cause problems. While it is not extremely common, we do see it often.
For example, if you have a script sending from email@example.com to firstname.lastname@example.org, and there is a forwarder setup to go from email@example.com to firstname.lastname@example.org, the forwarder will fail. This is due to the originating address being the same as the final forwarding address.
We are happy to help, but will need more information to troubleshoot further.
What is the sending address?
What is the receiving address?
How are you checking email: outlook, webmail, thunderbird, macmail?
Also, it may be easier to troubleshoot this issue with Live Tech Support
, so they can review the email log for errors in real-time.
They are available 24/7 via:
Phone: 877-595-4482 x2
Chat (there is a link on the top right).