so i make custom teplate :
mkdir -p /etc/e-smith/templates-custom/etc/postfix/transport
cd /etc/e-smith/templates-custom/etc/postfix/transport && touch 30route
vi /etc/e-smith/templates-custom/etc/postfix/transport/30route
30route
.asso.fr smtp:smtp.free.fr
future-b.eu smtp:smtp.free.fr
aol.com smtp:smtp.free.fr
cox.net smtp:smtp.free.fr
antboymusic.com smtp:smtp.free.fr
ig.com.br smtp:smtp.free.fr
terra.com.br smtp:smtp.free.fr
club-internet.fr smtp:smtp.free.fr
yahoo.com smtp:smtp.free.fr
yahoo.fr smtp:smtp.free.fr
noos.fr smtp:smtp.free.fr
tiscaly.com smtp:smtp.free.fr
tiscaly.fr smtp:smtp.free.fr
gmx.net smtp:smtp.free.fr
gmx.de smtp:smtp.free.fr
gmx.co.uk smtp:smtp.free.fr
ntua.gr smtp:smtp.free.fr
hellug.gr smtp:smtp.free.fr
free.fr smtp:smtp.free.fr
sfr.fr smtp:smtp.free.fr
loire-atlantique.fr smtp:smtp.free.fr
live.fr smtp:smtp.free.fr
hotmail.fr smtp:smtp.free.fr
hotmail.com smtp:smtp.free.fr
laposte.net smtp:smtp.free.fr
neuf.fr smtp:smtp.free.fr
wanadoo.fr smtp:smtp.free.fr
orange.fr smtp:smtp.free.fr
outlook.fr smtp:smtp.free.fr
monier-environnement.com smtp:smtp.free.fr
signal-event nethserver-mail-server-update
check PLS it should work !