problème postfix

[Philippe BERNARD <deb29@free.fr>]

Bonjour,

Je ne parviens plus à envoyer de mails sur la liste en utilisant mutt + 
postfix.
J'y parviens en utilisant thunderbird (ce que je fais).

Ci-joint mon fichier /etc/postfix/main.cf
Merci pour votre aide.
pb29

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

myhostname = maman
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = maman, localhost.maison, localhost
relayhost = 
mynetworks = 192.168.1.0/24
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all