After many tests I found that this is working :
in main.cf :
-----------
smtpd_sender_restrictions =
reject_non_fqdn_sender,
reject_unknown_sender_domain,
reject_sender_login_mismatch
smtpd_sender_login_maps = pcre:/etc/postfix/sasl_default_sender.pcre
in /etc/postfix/sasl_default_sender.pcre
--------------------------------------
/^\@/ 510 Invalid address format.
/[!%\@].*\@/ 511 This server disallows weird address syntax.
/^([a-zA-Z0-9.\-_]+)@my_domain.com$/ ${1}@my_domain.com
!/^([a-zA-Z0-9.\-_]+)@my_domain.com$/ 550 Invalid address
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Thank you for helping
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