One of my mail accounts does not work, the other 2 work fine. Why?

One of my mail accounts does not work, the other 2 work fine. Why?


In Zoho Mail I have 3 accounts:

dagconsultores@gmail.com
dagconsultores@zoho.com
dagconsultores@cablenet.com.ni

The last one, with a server in Nicaragua, can not send mails, (error 55: no such domain in zoho.com). I receive mails without problems, but mails never can be sent.

The other two accounts work perfectly.

Please, help me in that aspect. It is the only thing that avoids the full use of zoho mail as my principal mail engine.

Hugo Sanchez
(zoho login: dagconsultores)