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What do you use as a lightweight SMTP for outgoing e-mails only?

I am running an app that sends e-mails via SMTP when events occur once in a while, and I dont need a fully featured e-mail server.

EDIT: I am more than happy to use something like postfix (and do), if thats the best choice. I was thinking there may be something much simpler, that runs out the box.

What do you use as a lightweight SMTP for outgoing e-mails only?

I am running an app that sends e-mails via SMTP when events occur once in a while, and I don't need a fully featured e-mail server.

EDIT: I am more than happy to use something like postfix (and do), if that's the best choice. I was thinking there may be something much simpler, that runs out the box.