Hope I've got the right end of your question here.
I'd use sendmail, it usually needs to be set up and configured but it's pretty standard and it's not as insane as some people make it out to be!
Then put a line like this at the end of your commands:
mail -s Install Finished email@example.com < /dev/null
This will very simply send you a blank email that has the subject line 'Install Finished'.
There's probably a better way to use the mail line - but I haven't been able to find one in the mail manual...
Hope this helps, or at least gets discussion going!