Cannot receive mail, but can send

Hi All,

Newbie here, so apologies if I do not give the correct information first hand

I am have a problem receiving mail to the server, but I can send mail without any issues

Ports that are open are: 110; 995; 993; 25; 143; 465
Server: EC2 Instance (on Ubuntu)

Error message from another email address is:
550 This domain is not hosted here

Email I’m sending to: