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Posted by Leythos on July 5, 2005, 11:29 am
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sutrasarma@hotmail.com says...
> Hello everybody,
>
> i'm administrating varius mail servers for our clients and on some of them i
> experienced a problem of sendig mail to certain domains. Messages for some
> domains remains into the quees with this message "The semaphore timeout
> period has expired". So i tried to telnet to one of this domain and i was
> soprised. I was unable to connect via telnet on port 25 to those servers. So
> i checked up if i can connect to those serves directly from the router and i
> did it. I think its a problem on firewall Watchguard X500 but its not under
> my menagments so i don't know what can be. On Cisco PIX firewalls there was
> a command fixup dns 512 that make similar problems. Somebody had similar
> experience?
The outbound SMTP does not care about DNS as far as the firebox is
concerned - if you can get outbound mail to any server you can get it to
all. If you have DNS problems, then you have DNS problems.
What kind of "Fix Up" do you need - are these external servers not given
public IP addresses in their A/MX records?
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