We've elevated the warmup process in the past 2 weeks to maintain very strong standards of the pool as its growing fast to ensure deliverability.
Every 6 hours we run an email validation check across the entire pool.
Those that don't make it then go through a try catch check (which is a little slower) to ensure they are valid.
Then those that don't make that go through a 6 step SMTP check.
This keeps high rep domains only on the warmup pool.
If there's bounces happening, it would be a good flag for you to review, it means there's changes even replies from your customers would be bouncing