You have not logged into the pop/imap server in the last 30 minutes
Many mail servers, including SiteGround's, are set up with pop-before-smtp. This is a Perl script that allows email relay control based on successful POP / IMAP logins.
In other words, you need to establish a valid POP or IMAP connection to your e-mail account before you can send e-mails.
If your e-mail client hasn't fetched your e-mail for more than 30 minutes and you try to send a message, you will most probably receive the following error:
"Perhaps you have not logged into the pop/imap server in the last 30 minutes or do not have SMTP Authentication turned on in your email client."
The solution is simple, you have to restart your e-mail client and fetch the new messages. Once you have done that, you will be able to send new emails.
You find this article useful? Click here to learn more about SiteGround web hosting experts and what else we can do for you!