SMTP Prober.
SMTP Prober is a utility for testing the setting for SMTP.
Version: 1.00 beta
Different SMTP providers have different requirements for their settings. For example some providers require the From Address and the Reply To address to be the same.
This is a portable tool that does not require installation to run.
The settings can be saved if required. The settings are stored in an INI file called default.ini. This file is saved and read from the same folder as SMTPProber.exe is located. Note if you are running this utility from a CD ROM (or any other read only device) you will not be able to save the settings.
Download SMTP Prober Here