Thanks Daniel, my log have evolued but i have always the problem. I use a mysql db authentification so I have replace your answer by :
local_recipient_maps = mysql:/etc/postfix/mysql-virtual_comptes.cf
with in mysql-virtual_comptes.cf :
hosts = 127.0.0.1 user = xxxx password = xxxx dbname = xxxxx table = users select_field = CONCAT(SUBSTRING_INDEX(username,'@',-1),'/',SUBSTRING_INDEX(username,'@',1),'/') where_field = username
in mail.log :
Aug 11 20:35:22 ns351550 postfix/local[24266]: DA0353BA95: to=contact@akairnet.com, relay=local, delay=0.13, delays=0.12/0/0/0, dsn=5.1.1, status=bounced (unknown user: "contact")
Kurt
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