Sending problem using Postfix/Mailman

Hi,

Im using postfix 2.1.5 r1 + mysql 4.0.22 + vexira for mailserver 2004 +
courier-imap 3.0.8 + mailman 2.1.5 r3. on Gentoo Linux 2004.3

The instalation guide I used for installing all the software:
http://www.gentoo.org/doc/en/virt-mail-howto.xml

I'm trying to send mail to a mailman list with 300 email members.

When executing "mailq" the following error in the mailqueue:
"(lost connection with 127.0.0.1[127.0.0.1] while sending RCPT TO)".

In the /var/log/mail/current the mail log show the following error:
"Feb 1 17:12:57 [postfix/smtp] 0E74FC1381: to=<user@domain.com>,
relay=127.0.0.1[127.0.0.1], delay=0, status=bounced (host
127.0.0.1[127.0.0.1] said: 556 Number of recepients exceeds the limit
(in
reply to RCPT TO command))"
(user@domain.com is an example of a subscriber on the mailman list)

All the other mail lists in Mailman, if there's only a few members, do
work.

The smtpd_recipient_limit = 1000 when executing "postconf" and in the
Mailman config file Defaults.py the
SMTP_MAX_SESSIONS_PER_CONNECTION = 1000.