When a new user imports thousands to tens of thousands of contacts into BirdSend, the 1st email message to the newly imported contacts will be throttled.
All ESPs do this, so no surprise there.
But for this new improvement, the throttle settings are further refined, so that we further improve our already great deliverability.
Because when it comes to improving, it’ll never be “done”. There will always be things that you can improve.
We can’t reveal too much info because it’s sensitive — we don’t want spammers trying to game the system.