I prefer Mail::Sendmail over Net::SMTP as it makes things even simpler, but using Net::SMTP allows you to hold the connection open and send all 3 in one go.

If you are running a SMTP server on localhost you shouldn't have a problem with speed. I have a CGI script that sends up to 10 in one go which runs fine. If I was, I'd either fork (if I didn't care about NT) or spool locally.

Of course there are other options, I've handled this before by having a flag in the DB that says 'email this user X' and a cron job that handles it.

Hope this helps...