always_bcc and default_destination_concurrency_limit
I'm trying to use postfix-3.5.7 to throttle email to freemail domains
like gmail and yahoo, but having some problems. I'm able to throttle
it for users @gmail.com, but not for domains that use google as their
MX because the recipient is not @gmail.com, for example.
For this reason, I thought I could just generally throttle the default
delivery, and create another delivery agent that increases concurrency
for domains I know to be able to manage what is normally the default.
Hopefully that makes sense.
The problem is that I'm using always_bcc to deliver a copy of each
email locally, and by modifying the default delivery agent:
This results in emails to my always_bcc user sitting in the active
queue for an excessive period. I tried to explicitly define this
recipient to be processed by the local delivery agent, but that didn't