I have 4 sites on one of your severs. I am unable to access my email via a 3 party program. This issue is only happening for one site. I have used this method so that I can check multiple emails on one program.
I am getting the following error:
Send Mail: Error verifying 'To'
Server Returned: 5.7.1 <MY IP ADDRESS>: Client host rejected: Access denied (#554)
I am on homiemail-sub4 so its not down...