If you switch to a new sender domain for your email marketing campaigns, then you need to implement a proper warm-up strategy. Gradually increase the volume of your outgoing emails, starting with a small number and slowly ramping up, which will help establish a positive sender reputation for the new domain. Continuously monitor the performance of the sender domain and adjust strategies as needed. Keep a close eye on metrics such as open rates, click-through rates, and bounce rates to assess the efficiency of the domain transition.
A more curated list can be found here, please check out this link:
1. https://mailbluster.com/blog/aws-ses-best-sending-practices-to-maintain-reputation
2. https://mailbluster.com/blog/email-marketing-best-practices
Also, after you move to a new domain, it’s best to configure SPF, DKIM and DMARC records for your sender domain properly for better email deliverability and verify it accordingly in AWS. For this, you can follow this guide