Thanks for the correction. The LWP man page just said the message is "passed on to the mail system," and since it's formatted just like a POST HTTP request, I didn't know if that was on the local system or a remote one as in a more typical HTTP request. I didn't see how it could possibly work reliably through a web server, but didn't want to make too many assumptions. Since sendmail isn't available on all systems, that seems like a fairly brittle way to do it, when there are other mail modules that will talk SMTP as well.