Hi @min ,
Can you confirm you followed all of the steps outlined here: Configure Amazon SES as External SMTP Email Provider
Can you successfully send yourself a test email by clicking the “Send test email” button? Do you have any tenant logs for email delivery failures (log type fn)?
Additionally, here is a Community post describing an issue with Amazon SES and emails not being sent: When Using Amazon SES, Emails are not Being Sent
I look forward to your reply!
Best,
Mary Beth