Blat
From WPKG | Open Source Software Deployment and Distribution
Blat is a public domain command line smtp (email) client for Windows. This is a silent installer and deinstaller for Blat.
<package id="blat"
name="blat"
revision="1"
reboot="false"
priority="0">
<check type="file" condition="exists" path="%PROGRAMFILES%\blat\blat.exe" />
<install cmd='cmd /c mkdir "%PROGRAMFILES%\blat"' />
<install cmd='cmd /c copy /y "%SOFTWARE%\blat\full\*.*" "%PROGRAMFILES%\blat"' />
<upgrade cmd='cmd /c copy /y "%SOFTWARE%\blat\full\*.*" "%PROGRAMFILES%\blat"' />
<remove cmd='cmd /c rmdir /s /q "%PROGRAMFILES%\blat"' />
</package>