When sending through SES there is a From: header and an Envelope-From: header in the outbound message The From: header will have your from address "email@example.com" and this is the address mail would be sent to if the recipient replies to the message. If the message bounces the bounce is sent to the Envelope-From address which by default is formatted as <SES-Message-ID>@amazonses.com when sending sending through SES. All bounces are sent to this address, the Envelope-From: address, SES then receives the bounces and will then either forward them to the From: address if no Event Notifications are configured and this method does require a working email address to receive the notifications or if Event Notifications are configured the bounce notification is then sent to the SNS Topic you specify. https://docs.aws.amazon.com/ses/latest/dg/monitor-sending-activity-using-notifications-email.html
You do have the option of using a Custom MAIL FROM address which will change the domain of the Envelope-From: to one you verify with SES and this will require your domain to have a DNS record pointing to the SES.
It is best practice to have a From: address you can receive mail in, but not required to receive the bounce notifications when using an SNS topic to receive the bounce notifications
IIFC, SES only handles publishing feedback to the configured SNS topics for standard MAIL FROM domains. If you have defined a custom MAIL FROM for the Verified Identity, then you will need to create a Email Receiving Rule Set to accept mail for the custom MAIL FROM domain and publish it to the feedback topic(s).
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