Sending mail from the command line, in an automated way
Solution 1:
SendEmail seems like a nice tool for that. From what I get from the documentation it would be just a call like this:
sendEmail -f <myadress> -t <destination> -u <subject> -m <message> -a <pathtofile> -s <serveradress> -xu <username> -xp <password>
Solution 2:
Another option is the ssmtp package. Since it's a sendmail emulator, it is highly compatible with all kinds of stuff that might want to send email.