Thank you for your interest in WorkMail and yes you can combine this with SES. You can set-up WorkMail and use that without any worry of SES. For your custom ticket system you can add a rule in the SES inbound rules section. This for the ticketing system email address to be a different action than WorkMail.
For more information on the SES inbound rules: https://docs.aws.amazon.com/ses/latest/DeveloperGuide/receiving-email-receipt-rules.html
Thank you, Robin.
After some testing I can confirm that I can use both services on the same domain at the same time!
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