qmail - how bundle mails?

[Thomas K�nig]

Hi,

how does i reach, so that qmail will send mail to different users
in the same domain as bundle?
e.g. [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
with one connection, so that only one mail must be send over the net
with the information to the smtp server, that this mail is for more
user.

the background is:
I've a mailing list server, and we pay for traffic.
On the server ist installed qmail, vpopmail and ezmlm.

any ideas?

tom