buenas tardes
me pueden apoyar en decirme por que cuando mando un email a unas direcciones m esta marcado error .Este es el error
The original message was received at Wed, 5 Oct 2016 14:28:21 -0500 from [192.168.0.253]
----- The following addresses had permanent fatal errors ----- <administracion@cyanmedica.commailto:administracion@cyanmedica.com>
(reason: 554 bosimpinc12 bizsmtp Connection rejected. Reverse DNS for 189.240.35.147 does not exist.) <cesar.athie@cyanmedica.commailto:cesar.athie@cyanmedica.com>
(reason: 554 bosimpinc12 bizsmtp Connection rejected. Reverse DNS for 189.240.35.147 does not exist.) <servicio.clientes@cyanmedica.commailto:servicio.clientes@cyanmedica.com>
(reason: 554 bosimpinc12 bizsmtp Connection rejected. Reverse DNS for 189.240.35.147 does not exist.)
----- Transcript of session follows ----- ... while talking to mx.mydomain.com.:
<<< 554 bosimpinc12 bizsmtp Connection rejected. Reverse DNS for 189.240.35.147 does not exist.
554 5.0.0 Service unavailable
tengo centos 6.4 y uso sendmail
gracias