On second thought, * Junior Tux <junior.pe...@gmail.com>: > qmgr_clog_warn_time = 0
you might want to leave that at the default value to get helpful information. > smtpd_milters = inet:localhost:10026 This milter could be a problem if it is slow. > soft_bounce = yes On a prodcution machine, this will increase the load in most cases (senders retrying instead of giving up). > virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf > virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf If your database is slow or overloaded with connections, this might could slow down mail delivery. Postfix logs lookup problems, so you can verify that quite easily. Cheers Stefan