MAIL FROM domain in a From address

This may accomodate your request:

• When setting up the custom MAIL FROM domain in SES, use a subdomain that is unique and separate from the subdomain you will use for WorkMail. For example, mail.example.com for SES and workmail.example.com for WorkMail.
• Verify the ownership of the subdomain for WorkMail by adding the appropriate DNS records as per the AWS documentation.
• Once both the subdomains are verified, you can send emails using the FROM address matching your domain (example.com) through both SES and WorkMail.
• Check that the MX records for the SES subdomain (mail.example.com) are configured correctly to point to the appropriate SES region.
• It may take some time for the changes to propagate before emails stop landing in spam. You can check the AWS documentation for more details on troubleshooting email delivery and spam issues.

If you are not running a separate mail server under the mydomain.com domain, the subdomain part of the MAIL FROM domain can be empty. However, please check the notes in the Document.

If you have to use the MAIL FROM domain in a From address, either disable email feedback forwarding and receive your bounces through Amazon SNS notifications, or ensure that your MAIL FROM domain is not the destination for feedback forwarding. https://docs.aws.amazon.com/ses/latest/dg/mail-from.html

Since other mail servers are often operated under maydomain.com, it is usually necessary to set up a subdomain exclusively for SES to verify the mail when sent.