I created a newsletter and attempted to send myself a preview copy. It failed and displayed the following error message:
550-IMAP/POP3 server before sending your message. gator692.hostgator.com
550-(whenthemosescameagain.com) [22.214.171.124]:56272 is not permitted to relay
550 through this server without authentication.
I’m using standard Gmail settings and I have POP3 set to Enable. How do I ensure that newsletter emails get delivered for my client?