MercuryC SMTP Client.
Smart host name is the same as the SMTP server name in your email settings. That's the mail server your ISP has for you to send email out through.
Announce myself as can probably be blank (it will use the internet name you put in when you installed Mercury originally).
Does your ISP require you to use a username and password to send email?
And last, towards the bottom, there's a General section. Under General Log File, enter a full path and file name for the log file, if there isn't one already. If you're using the Mercury that comes with Xampp, it should be
(This will create a new log each day, with the date as part of the file name, in the form of SMTP2004-11-30.log)
If you downloaded Mercury direct from pmail.com, put in
(unless you changed the install directory.)
Under that, there is another box for the Session Log Directory. Put
and check the check box that says Enable session logging.
Now, try to send a message.
If you look in the log directory, you'll see a .log file, and another file that should end with .ms. The .ms file is the session log, and has everything that happened while you tried to send the message. You can open it in Notepad, and should be able to copy & paste the contents here. That should tell us what's happening.