I created a newsletter and attempted to send myself a preview copy. It failed and displayed the following error message:
Mailer Error: SMTP Error: The following recipients failed: firstname.lastname@example.org<p>SMTP server error: Please turn on SMTP Authentication in your mail client, or login to the
550-IMAP/POP3 server before sending your message. gator692.hostgator.com
550-(whenthemosescameagain.com) [220.127.116.11]: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?