Calling:

Linux:
./sendEmail.pl  -f from@email.com -t to@email.com -s mailserver.domain.com -xu username -xp password -u Subject -m Message -a appendfile.ext

Win32:
sendEmail.exe -f from@email.com -t to@email.com -s mailserver.domain.com -xu username -xp password -u Subject -m Message -a appendfile.ext