Sending from and receiving to priority mail to on account.

[Rodolfo González González]

Good day,

I have a customer who sends and receives a large number of messages on a 
given moment to/from a number of his accounts. He also has an account 
which needs to receive many mail messages with high priority, mostly 
from its same domain, but some messages also coming from Hotmail, Gmail 
and other services. The problem is, that if there are many queued 
messages, those messages directed to the particular "VIP" account take 
long time before they are sent to its maildir, and the VIP gets upset.

I know that Postfix's queue is shared and so, but, is there any way to 
send those messages directed to the "VIP" account before the others? 
Googling I've read about setting up two instances or using the relay 
transport, but I don't know if that applies to my use case, or how to 
configure it.

Thanks in advanced.