Problemas con envio de correos postfix

"Alejandro C. González Chávez" <[email protected]>
Newsgroups gmane.org.user-groups.linux.gulcr
Message-ID <[email protected]>
Hola amigos, como les va, tengo serios problemas con
el postfix, continuamente hay problemas de correos:

A0D631BD8     24792 Mon Feb 19 12:21:30
[email protected]
(host mailproxy3.cablenet.com.ni[165.98.148.3] said:
421 Error: timeout exceeded (in reply to end of DATA
command))
                                        
[email protected]
                                        
[email protected]

BD2BA20BB     58613 Mon Feb 19 14:32:31 
[email protected]
(delivery temporarily suspended: lost connection with
mx4.hotmail.com[65.54.244.104] while sending end of
data -- message may be sent more than once)
                                        
[email protected]
(host mail2.credomatic.com[12.150.195.215] said: 421
Transmission channel timeout. (in reply to end of DATA
command))
                                        
[email protected]
(connect to
finotexmail.finotex.com.co[200.106.139.99]: server
dropped connection without sending the initial SMTP
greeting)
                                        
[email protected]

BC6DA2312      3175 Sat Feb 17 08:42:35  MAILER-DAEMON
(delivery temporarily suspended: lost connection with
mx2.hotmail.com[65.54.244.168] while sending end of
data -- message may be sent more than once)
                                        
[email protected]

BF8191FC9     10093 Mon Feb 19 18:06:33 
[email protected]
(delivery temporarily suspended: lost connection with
mx4.hotmail.com[65.54.244.104] while sending end of
data -- message may be sent more than once)
                                        
[email protected]

CA47E2313      3277 Sat Feb 17 08:42:35  MAILER-DAEMON
(delivery temporarily suspended: lost connection with
mx4.hotmail.com[65.54.244.104] while sending end of
data -- message may be sent more than once)
                                        
[email protected]

He revisado la configuración de mi postfix y la tengo
según los manuales que aparecen en Internet, esto es
problema de dns?.

Si alguno me puede ayudar le agradecería.




A.C.G.CH.
Telf: Casa 00505-5323667
Cel:00505-8354400
[email protected]

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