SMTP Finder is a utility that will allow you to quickly find out the mail server address of a particular domain. It's remarkably simple to use and requires nothing more of you than a finger to enter the domain (e.
g. softonic. com) before it will go off and retrieve the mail server detils for you, which it does very reliably.
It might have been nice if the developers had built in some connectivity with Outlook or Outlook Express, such as the ability to export the SMTP settings to your Outlook mail config.