> I am reminded why I left AWS and how I need to finish the job, get off AWS Workmail, move my domains from Route53 and never return.

Well, besides for the fact that the author's got suspended for no reason, WorkMail is being shut down March 2027 anyway. I recommend checking out Purelymail for a budget, batteries included option. Another option is to run your own server but have it use something like AWS SES to send externally, avoiding the IP reputation issue.