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Mail bounced back externally - internally ok.

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Operating Systems AIX Mail bounced back externally - internally ok.
# 1  
Old 06-26-2009
Mail bounced back externally - internally ok.
I am unable to send mail externally. It gets refused from any mail server.
Here's my current config:
oslevel -s
5300-07-05-0831
********
mail -v foo@yahoo.com < /tmp/oracle.out
Warning: .cf file is out of date: sendmail AIX5.3/8.13.4 supports version 10, .cf file is version 9
foo@yahoo.com... Connecting to d.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to a.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to c.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to g.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to f.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to b.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Connecting to e.mx.mail.yahoo.com. via esmtp...
foo@yahoo.com... Deferred: Connection refused by %se.mx.mail.yahoo.com.
***************
mailq|pg
/var/spool/mqueue (139 requests)
----Q-ID---- --Size-- -----Q-Time----- ------------Sender/Recipient------------
n5QDLtF33305684 2002 Fri Jun 26 09:21 foo
(Deferred: Connection refused by %se.mx.mail.yahoo.com.)
foo@yahoo.com
*******

pg sendmail.cf

##################
# local info #
##################

Cwlocalhost
# file containing names of hosts for which we receive email
# Fw/etc/mail/local-host-names

# my official domain name
# ... define this only if sendmail cannot automatically determine your domain
#Dj$w.Foo.COM
#Dj


Any ideas?
Even with the apparent backleveled sendmail.cf version, sendmail still works just not externally.
# 2  
Old 06-26-2009
Looks like network problem (firewall, proxy?)

Try
#telnet f.mx.mail.yahoo.com 25

and check if can connect on that port.
# 3  
Old 06-26-2009
# telnet f.mx.mail.yahoo.com 25
Trying...
telnet: connect: A remote host refused an attempted connect operation.
# 4  
Old 06-28-2009
Remember, that if you send mail via external MX, you need to have user name, password, DNS, reverse DNS configured...and other things that are checked to protect spam by MX.

Yohoo isn't open-relay, I suggest you to configure postfix on some linux box (including all things that are checked by anty-spamm) and then try.
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