Email sent undeliverable 550 error

eqiserv Posts 2 Registration date Wednesday June 28, 2017 Status Member Last seen June 29, 2017 - Updated on Jun 28, 2017 at 05:58 PM
 Peter - Aug 18, 2022 at 06:02 AM
I receive emails through Outlook with out problems but get undeliverable messages with 550 error when replying and/or sending

1 response

Blocked Profile
Jun 28, 2017 at 04:39 PM
You have not set the SMTP server configurations correctly. EVERY ISP has there own SMTP services, and you need to use your ISP to authenticate you! Contact your ISP!

550 Blocked error or 550 Requested action not taken: mailbox unavailable is an SMTP (Simple Mail Transfer Protocol) error code. Put simply, this message means that the email you sent was blocked by the recipient's email hosting server, and returned to you.