MX Problem.

[Lu!s Croker]

   Hi,  I have a problem... 

   I can not send mails to specific domain which is  pvcomm.com.mx.
   When I send it, I get a error like this... 



   ----- The following addresses had permanent fatal errors -----
<user at pvcomm.com.mx>

   ----- Transcript of session follows -----
550 5.1.2 <user at pvcomm.com.mx>... Host unknown (Name server:
pvcomm_mail.pvcomm.com.mx.: non-recoverable error)




   My DNS server can resolve pvcomm.com.mx and pvcomm_mail.pvcomm.com.mx
(MX record), actually if I connect it with telnet and using 25 port, I
can send and receive SMTP commands, but doing it with a mail client, I
cant sent mails. 

   Thanks a lot. 



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