I've not looked into either sendmail or postfix for large numbers of users, so I can't answer that for you. However, I am quite sure that pop3/smtp can be achieved in Postfix via "virtual accounts".
learn something new everyday...<BR><BR>This was made super easy because of apt4rpm:<BR><BR>get and install postfix and switchmail package:<BR><BR>apt-get install postfix redhat-switchmail ...
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