Could not connect to SMTP host. Message could not be sent

Question

When I sent email from server then it gives me two error -

SMTP Error: Could not connect to SMTP host. Message could not be sent. Mailer Error: SMTP Er

Answer 1

The Gmail Help :

Still can't send mail?

If you tried configuring your SMTP server on port 465 (with SSL/TLS) and port 587 (with STARTTLS), but are still having trouble sending mail, try configuring your SMTP to use port 25 (with SSL/TLS).