Erreur d'envoie Sendmail

Bonjour,

Lors de la mise en place de mon serveur en prod, je remarque un problème concernant l'envoi de mails depuis ce serveur. Les logs n'ont l'air de bien se transmettre :
je fais un tail -10 /var/log/maillog :

Jun 30 10:32:31 localhost sendmail[5052]: p5P7YVJY003898: p5U8WVel005052: return to sender: Cannot send message for 5 days
Jun 30 10:32:31 localhost sendmail[5052]: p5U8WVel005052: to=root, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=33592, dsn=2.0.0, stat=Sent
Jun 30 10:32:31 localhost sendmail[5052]: p5P7YVJZ003898: p5U8WVem005052: return to sender: Cannot send message for 5 days
Jun 30 10:32:31 localhost sendmail[5052]: p5U8WVem005052: to=root, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=33945, dsn=2.0.0, stat=Sent
Jun 30 10:32:31 localhost sendmail[5052]: p5P7YVJa003898: p5U8WVen005052: return to sender: Cannot send message for 5 days
Jun 30 10:32:31 localhost sendmail[5052]: p5U8WVen005052: to=root, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=37291, dsn=2.0.0, stat=Sent

Voici mon fichier host :

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6

127.0.0.1 server.intranet

#192.168.50.81 localhost-eth0
#192.168.50.10 localhost110
#192.168.50.11 localhost111
#192.168.50.12 localhost112

Si quelqu'un a déjà eu ce problème, merci de vos réponses