I have installed postfix, dovecot on my server. Now I am creating SMTP server and when validating server after adding the details I am getting the error:
- Connection could not be established with host 172.104.171.192 [ #0]
Log data:
++ Starting Swift_SmtpTransport
!! Connection could not be established with host 172.104.171.192 [ #0] (code: 0)