>smtpd_timeout = 20s >smtp_connect_timeout = 30s ... this nees to be big also, since if the MX is really slow, it will be very slow in the connection phase.
the others look ok, but only you can decide how much you want to slow down your server to get mail to extremely slow MXs. Note in the pflogsumm report that most msgs live on the Imgate queue for less that 10 seconds, which is from the time postfix queues the msg until the msg is delivered and removed from the queue, a period which includes DNS query, and the entire SMTP dialog. Len
