You could try to set
smtpd_sender_restrictions = ...
and add/modify the contents of
check_sender_access pcre:/etc/postfix/sender_access.pcre
See http://postfix.cs.utah.edu/postconf.5.h … strictions
and
http://postfix.cs.utah.edu/access.5.html
user@ Matches all mail addresses with the specified user
part.