SES feedback-smtp always returns "550 Mailbox does not exist!"

Hi,

I'm attempting to setup inbound email reception with SES. I've been able to send email via SES and have even configured a custom "MAIL FROM" domain. I would like to receive email via SES (region us-east-1 - feedback-smtp.us-east-1.amazonses.com) using said "MAIL FROM" domain.

For documentation purposes I'll use the top level domain of example.org.

I have setup the following subdomains in verified identities (with a status of Verified):

• example.org
  • For this verified identity I setup "e.example.org" as the Custom MAIL FROM domain and have added the following DNS records:
    • MX: e.example.org 10 feedback-smtp.us-east-1.amazonses.com
    • TXT e.example.org "v=spf1 include:amazonses.com ~all"
• web.example.org
  • For this verified identity I setup "e.web.example.org" as the Custom MAIL FROM domain and have added the following DNS records:
    • MX: e.web.example.org 10 feedback-smtp.us-east-1.amazonses.com
    • TXT e.web.example.org "v=spf1 include:amazonses.com ~all"

I also added the "e.example.org" and "e.web.example.org" domains to the "verified identities" as well in troubleshooting thinking that was preventing my reception of email. Both of those domains have a status of "Verified" as well (However, I did NOT setup Custom MAIL FROM domains for them as I never intend to send from them).

Next, under "Email receiving" I configured and set as Active an Email receiving Rule set. Currently I simple have a rule with no conditions (hopefully allowing any address at any verified "MAIL FROM" domain) and have configured the rule set to deliver any inbound email to an S3 bucket. I have verified that the S3 bucket did receive the "AMAZON_SES_SETUP_NOTIFICATION" initial object.

Upon attempting to send an email to web@e.web.example.org I only ever receive a "550 Mailbox does not exist!" response from feedback-smtp.us-east-1.amazonses.com.

Here is an example SMTP session:

220 feedback-smtp.us-east-1.amazonses.com ESMTP Amazon SES IDYgKflWQDWmMss9AcLD
EHLO A.B.C.D
250-feedback-smtp.us-east-1.amazonses.com
250-8BITMIME
250-SIZE 40960000
250-STARTTLS
250 Ok
MAIL FROM:<user@example.org>
250 Ok
RCPT TO:<web@e.web.example.org>
550 Mailbox does not exist!

Finally, I want to include that I am connecting to feedback-smtp.us-east-1.amazonses.com from an IP address that is included in the SPF record for example.org.

Any suggestion on troubleshooting/debugging the "550 Mailbox does not exist!" error? So far I'm unable to get any kind of debug or error messages in either CloudWatch or SNS.