It is possible that if some of the system settings and classic system settings are not setup correctly to use a From address that you will receive a communication error as a response. One example, would be when trying to submit the Forgot Password form found on the userside login page. An error message of this nature would look something like this:
As mentioned this is because there is no From address setup in the system.
Please allow 10-15 minutes for the userside to update (Clear the cache) before you try the password reset or other mailing links again.
To fix this issue we would just need to update the Reply-to Admin Email Address found under Classic System Settings
Once we have updated the email address this issue should be resolved. If the issue is still not resolved after completing these fields please contact support for further assistance.