127.0.0.1:2552 inet n  -       n         -       2000     smtpd
    -o receive_override_options=no_header_body_checks,no_address_mappings

if header exist (postfix will checks via header_cheks)
    no rewrite
else
    rewrite with virtual_alias_maps

header_checks = regexp:/etc/postfix/mycustomheader

/^X-Your-Header/  FILTER smtp:[127.0.0.1]:2525