How to deal with slow receiver issue in Postfix

[rahulr178]

We are sending emails to destinations and the email traffic is high but recipient server is not accepting all emails due to their security rules and source emails can't be restricted.

How to deal or configure postfix here that in case of bulk emails, postfix shouldn't delay emails of other domains? In case of bulk emails, active queue grows and it affects the emails of other receiver domains which is not creating any issue.

[TrevorH]

This sounds awfully like "I am a spammer, please help me to spam more effectively"