Although you are correct that using the envelope to send the same message to multiple recipients on a single mail server is much more efficient, it does not solve the users problem, since it was specifically stated that all messages have dynamic content.
I would also agree that you should let the mail server do the hard work for you. If you want your program to run quickly, then tell your mailer to queue the message for later delivery. It will return immediately, and be ready for the next message. At some later point (seconds or minutes later), a queue runner will pickup the waiting messages and send them out. This means your program can run quickly, even though the messages will be limited in the speed that your mail server can send them out.
If you are using qmail, using qmail-inject will do this automatically. If using sendmail, I believe sendmail -ob (or maybe -oq) will do it. If you are sending directly through SMTP, then of course this technique doesn't apply.
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