Hello,
I have gone through with your project details and can help you to set up and configure Amazon SES with the email marketing provider Sendy as I have experience with both.
I will create all mailing authentications like SPF, DKIM, DMARC etc. for better email deliverability.
I have more than 6 years of experience in bulk mailing, email marketing, SMTP'S Power MTA, Interspire, Sendgrid, Mailwizz, Active Campaign, Mautic, Mumara, Sendy, AWS SES and Oempro mailing application with secured server set up.
I would like to have a discussion with you to explain things in a better way.
Thank You