DMARC, SPF, and DKIM are the keys to email deliverability.
Make adjustments to the sending speed based on your current spam rate. If the spam rate increases, slow sending. If the spam rate decreases, ramp up sending.
Send from up to 5 emails / domain. Mitigate risk by spreading sending emails from multiple domains.
Follow email deliverability best practices. Gradually increase the volume of emails you're sending. Maximize daily limits, without getting in trouble.
Domain Settings - SPF, DKIM, DMARC
Sending Accounts / Domain
Decrease Spam, Increase Sending Volume
Dynamic Warmup Schedule
3 Emails / Domain (up to 3 Emails)
3 emails / domain (up to 9 emails)
5 emails / domain (up to 25 emails)