wordpress SMTP not sending emails – Connection refused (111)

WordPress is not sending e-mails.
My contact forms stopped working a few days ago, not sure when.
I tried different plugins for contact form. None of them worked.
Then I tried with manual wp_mail() and mail() functions… They also don’t work.

Then I installed “WP Mail STMP” plugin…

Filled STMP information:

Host: smtpout.secureserver.net
Ports: 80, 3535, 25, 465 (SSL)

Tried all ports with and without Authentication (username and password).

I got error

SMTP -> ERROR: Failed to connect to server: Connection refused (111)

I then tried Gmail SMTP:

Server: smtp.gmail.com
Use Authentication: Yes
Use Secure Connection: Yes (Checked both TLS or SSL)
Port: tried both 465 and 587

Still got same error:

SMTP -> ERROR: Failed to connect to server: Connection refused (111)

Please Help me…!