I am not farmiliar with any. However conceptually i think this may be of aid - RCPT TO commands to SMTP are not included in headers. Should you use multiple RCPT TO commands per message you are not compromising your users' privacy (behavior is like BCC). Unless it's important to you to have a personalized To header i think your wisest choice would be to just mail it like that.

Several months ago when i had fun reinventing wheels all the time I wrote a no-module thing to do that. It worked pretty well for a little (50 subscribers) list I had going. The fun is that you leave the hard work for your sendmail...

-nuffin
zz zZ Z Z #!perl

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