garan,
I can tell only that qmail is used for a long time since very early Plesk versions and it is tested in this time much more better, than postfix which has appeared only since Plesk version 9.
Postfix has been requested by a lot of of clients and consequently we began to use it in Plesk. This is recent implementation and we will improve Postfix support.
I can tell only that qmail is used for a long time since very early Plesk versions and it is tested in this time much more better, than postfix which has appeared only since Plesk version 9.
Postfix has been requested by a lot of of clients and consequently we began to use it in Plesk. This is recent implementation and we will improve Postfix support.