Having problems with setting up SES

Hi all,

I am trying to get my e-mails to go through AWS SES. However, when I send emails, they seem to disappear into the ether; I'm also not receiving emails, and people sending to me tell me they are getting a "550 Mailbox does not exist!" bounce report.

I have set up an MX record, but it doesn't seem to be working. Here are some screenshots of some information I've been able to glean (apologies for not being a technical person myself!):

https://pasteboard.co/IT5zsGt.jpg
https://pasteboard.co/IT5zKnu.jpg
https://pasteboard.co/IT5Aa7N.jpg

If anyone can see what I might be doing wrong, I would be extremely grateful if they could let me know!

Thanks and warm wishes to you!