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
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.
(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 "email@example.com" there are "firstname.lastname@example.org, email@example.com, firstname.lastname@example.org" etc.
In Linux, most mail server implementations respect the file