My recipient cannot receive my mail in specific domain Kya.go.ke

Am sending mails to domain kaa.go.ke but they can’t receive and no bounce back.I can receive their mails

It’s possible that they stick in queue.
Please check “view queue” in webadmin

In the webadmin they are not there…Even no bounce back message am receiving. Is it problem on my side ?

It seems port 25 is unaccessible to kaa.go.ke
Please test your connections with mxtoolbox.com