how to send potentially hundreds of thousands of emails within a short time-frame, and to NOT look like a spammer.
In short, authenticate correctly and send from an IP that already sends that volume. One of the key things that'll get your send bulked is a sudden increase in volume, even if you authenticate fully.
In short, authenticate correctly and send from an IP that already sends that volume. One of the key things that'll get your send bulked is a sudden increase in volume, even if you authenticate fully.