OK merci. Du coup pour virtual_alias_maps j'obtiens :
# /etc/postfix/main.cf
virtual_alias_maps = hash:/etc/postfix/virtual, mysql:/etc/postfix/mysql-virtual-alias-maps.cf
Test :
mail -s Test root
=> Extrait de log :
Feb 23 18:17:15 domain postfix/pickup[30310]: 4CAEC2460A8A: uid=0 from=<root>
Feb 23 18:17:15 domain postfix/cleanup[30368]: 4CAEC2460A8A: message-id=<20150223171715.4CAEC2460A8A@domain.tld>
Feb 23 18:17:15 domain opendkim[17453]: 4CAEC2460A8A: DKIM-Signature header added (s=mail, d=domain.tld)
Feb 23 18:17:15 domain postfix/qmgr[30311]: 4CAEC2460A8A: from=<root@domain.tld>, size=432, nrcpt=1 (queue active)
Feb 23 18:17:16 domain postfix/local[30372]: 4CAEC2460A8A: to=<root@localhost>, orig_to=<root>, relay=local, delay=1.1, delays=0.09/0.02/0/1, dsn=2.0.0, status=sent (delivered to command: procmail -a "$EXTENSION")
Feb 23 18:17:16 domain postfix/qmgr[30311]: 4CAEC2460A8A: removed
Petit problème : au final procmail stocke ça dans /var/mail/nobody. Pourquoi "nobody" et pas "root" ?