Mass Mailing help needed

[Paul Rubin]

"Jonathan Vanasco" <jvanasco at hotmail.com> writes:
> Until I got to the mass-mailing part of the gig.  Based on user
> registration opt-ins, they can receive certain mailings.  ...
> I dont know what that will do to
> postfix should i need to mail 50,000 people (will that fill up the
> disk w/tempfiles, will it skew  the mailqueue too much?) 

Why should we think those 50,000 people have really opted in?  Are you
sure you're not spamming?  What site is this for?