AlternC/etc/alternc/templates/postfix/myvirtual.cf

#
# %%warning_message%%
#

user = %%db_mail_user%%
password = %%db_mail_pwd%%
hosts =%%dbhost%%
dbname = %%dbname%%
query = select concat(path, '/Maildir/') from mailbox join address on address.id = mailbox.address_id join domaines on domaines.id = address.domain_id where concat(address.address,'@',domaines.domaine) ='%s';