when I send messages to certain contacts, they keep returning
 

I have contacts with the same domain which I always send e-mails to. Somehow
now some keep returning, I even have an e-mail of my own with that same
domain and now I can not receive it. Some work some don´t. How can I secure
that these e-mails do not keep returning?

when I send messages to certain contacts, they keep returning
 

what does the error message say?

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"Mauricio" wrote in message
...
I have contacts with the same domain which I always send e-mails to.
Somehow
now some keep returning, I even have an e-mail of my own with that same
domain and now I can not receive it. Some work some don´t. How can I
secure
that these e-mails do not keep returning?