can't receive mails

[andvvv]

hi, i am very new user to this, did setup on windows 2019 server as much as i can read all guides.
so far CAN send emails to hotmail, gmail, , but no luck with receiving emails. where to start to look? opened port 25, created MX record in DNS, thank you, victor.

[Admin]

When sending to the server, is there a bounce message? If it cannot deliver to the server the bounce message should indicate why. You might be able to check with using this command in a command prompt on an external machine:

telnet example.com 25

Also, you can use mxtoolbox to check:

https://mxtoolbox.com/diagnostic.aspx

It should give you information about what is failing.