I do not receive mail

I do not receive mail

Tengo la configuracion de MX correctamente y mi cuenta verificada pero siempre me manda error

Esta es la respuesta del servidor remoto:

554 5.1.1 < informatica@expressitologistic.com >: Dirección del destinatario rechazada: dirección no entregable: host mail-outgoing.relay-pe.svc.cluster.local[10.27.8.69] dijo: 550 5.7.1 < informatica@expressitologistic.com >: Dirección del destinatario rechazada: el buzón está fuera de servicio (en respuesta al comando RCPT TO)



 
No puedo solucionar el problema ya que hay veces que se reciben los correos pero de la nada deja de funcionar y vuelve al mismo error espero me puedan ayudar



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