I'm sure I'm missing something really simple here, but I have been banging my head against the wall for a few hours already.
Under 'Webmin' -> 'Webmin Configuration' -> 'Sending Emails' I am trying to configure webmin to use the following setting: "Send email using Via SMTP to remote mail server". I have entered the server I want to use 'smtp.example.com' but I need it to use a custom port (123) and not 25.
I have tried entering: 'smtp.example.com:123' and some other variations but just get the error "Missing or un-resolvable SMTP server hostname". If someone could show me the correct formatting it would be really appreciated.