the title says. but I mean send emails to many users without using cc and bcc
closed as not a real question by ThatGraemeGuy, RobM, Dennis Williamson, Sam, splattne♦ Oct 14 '10 at 16:28
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(This question is very unclear: which OS? Which mailserver? So the answer below is probably too generic)
Use alias addresses. The implementation is different on most mailserver daemons though.
So behind alias address "firstname.lastname@example.org" there are "email@example.com, firstname.lastname@example.org, email@example.com" etc.
In Linux, most mail server implementations respect the file