Mails not delivered to Outlook.com

Hello

Am out of the Sandbox and approved by AWS to send emails in production! Yayyy! Thanks Amazon!!!!

Two messages: didn't get delivered to outlook.com even after 30 minutes. I had emailed a few other email addresses, and they got delviered there.

I emailed manually from another email client to the same outlook email address, using the same email "from" and "reply to" as I had done with Amazon SES, and these emails get delivered. This was just to ensure that Outlook hasn't blocked the sending email address totally.

The two message IDs that didn't get delivered on outlook are:

01090179413f3a46-ba6aa91c-87b1-4ae5-95c9-dc05e75c4818-000000@ap-south-1.amazonses.com
0109017941453905-ee896c72-0923-4499-80ed-90dedeccceab-000000@ap-south-1.amazonses.com

Any help please?

Thanks