[Defender Pro] AWS-SES/Defender Pro conflict

When we enabled the AWS SES emailing service, our system was not sending any emails. Not the password resets, not the registrations, not the forms. By turning off all plugins and turning them on one by one, we determined there was a conflict with Defender Pro. On ce I disabled it, all started working properly. Can you guys shed some light on how to fix this? I would really like to keep on using Defender.