my email can send, but can’t recive !

i connect my domain "al-fai9al.com.sa" at domains.live.com, and it active.

then

i create one user "*** Email address is removed for privacy ***" as usual

then sign in to outlook and all ok, try to send message to my other email "*** Email address is removed for privacy ***"

i received on "*** Email address is removed for privacy ***" and on inbox not junk.

but

when try to reply to "*** Email address is removed for privacy ***" or send a new email to it, i reveived "Delivery Status Notification (Failure)‎" on "*** Email address is removed for privacy ***"

note that:

i have already connect other domain "al-fai9al.com" and create more than 1 user and all ok , send and recieve.

but i don't know what's up with this?!