Can I change Smtp port?

Sure; use servername:port format. As an example, if you want to use "smtp.provider.com" on port 579, simply enter smtp.provider.com:579 as your Smtp server address.

If no port is specified, default port (25) is used for Smtp connections.

Note for SendBlaster 2 users

SendBlaster 2 users can enter the port number into a specific "Port" field.