Is there an alternate SMTP port available?
On Linux Servers :
If port 25 does not work, you can use port 587 in conjunction with port 25. Using port 587 also provides with a more secure connection from the client to the server. You may also use SSL port 465 after securing mail from Plesk panel.
On Windows Servers :
If your ISP is blocking SMTP port 25, SMTP port 45 is also enabled and you may use it. You can also contact your ISP and ask them to unblock port 25 for outgoing traffic.
Having trouble? Contact us and our team will be happy to help.