Postifx

Bonjour,

j'utilise postfix+amavis sur debian etch
ca fonctionne bien, sauf que je ne recois pas les mail provenant d'un correspondant.
___________________extrait de mail.info______________
Mar 16 07:48:09 pf-srv postfix/smtpd[8994]: connect from toto.com[x.x.x.x]
Mar 16 07:48:09 pf-srv postfix/smtpd[8995]: connect from toto.com[x.x.x.x]
Mar 16 07:48:09 pf-srv postfix/smtpd[8996]: connect from toto.com[x.x.x.x]
Mar 16 07:48:09 pf-srv postfix/smtpd[8994]: F2E46390AE8: client=toto.com[x.x.x.x]
Mar 16 07:48:10 pf-srv postfix/smtpd[8995]: 05C86390AE9: client=toto.comx.x.x.x]
Mar 16 07:48:10 pf-srv postfix/smtpd[8996]: 08D65390AEA: client=toto.com[x.x.x.x]
...
Mar 16 07:53:10 pf-srv postfix/smtpd[8994]: timeout after DATA from toto.com[x.x.x.x]
Mar 16 07:53:10 pf-srv postfix/smtpd[8994]: disconnect from toto.com[x.x.x.x]
Mar 16 07:53:10 pf-srv postfix/smtpd[8995]: timeout after DATA from toto.com[x.x.x.x]
Mar 16 07:53:10 pf-srv postfix/smtpd[8995]: disconnect from toto.com[x.x.x.x]
Mar 16 07:53:10 pf-srv postfix/smtpd[8996]: timeout after DATA from toto.com[x.x.x.x]
Mar 16 07:53:10 pf-srv postfix/smtpd[8996]: disconnect from toto.com[x.x.x.x]
____________________________________________________

la connexion s'etablit, mais , a priori, mon serveur ne renvoie pas l'accusé de reception
en fouillant dans les forums, je vois que le master.cf se met plutot comme ceci:
smtp-amavis unix - - y - 2 smtp
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o disable_dns_lookups=yes
-o max_use=20

moi, j'ai cela (repiqué d'une version antérieure):

_________________________________fin de master.cf________________
smtp-amavis unix - - n - 10 smtp
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o disable_dns_lookups=yes

127.0.0.1:10025 inet n - y - - smtpd
-o content_filter=
-o local_recipient_maps=
-o relay_recipient_maps=
-o smtpd_restriction_classes=
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o strict_rfc821_envelopes=yes
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
_______________________________________

1ere question: ou peut-on trouver les parametres de la commande smtp-amavis?
2eme: est-ce lié a mon pb?

merci d'avance