I have it spaced out so it waits 3-4 minutes between sends. This way I get it so it just sends emails all day.

This is how you avoid microcuck domain blocks...

One way, the easiest way is to make it act like a human and not be a douche nugget about it.

Currently sitting at 80-90% deliverabitlity with minimal manual data cleaning. Could probably get it to 95% plus, but I don't have the extra cash to run the emails through smtp checks right now.