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MX Record Preference

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MX Record Preference - 26.Aug.2004 6:38:00 PM   
Danofre

 

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What would happen if I set my MX preference for 2 mail servers equal?
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RE: MX Record Preference - 26.Aug.2004 7:55:00 PM   
Henrik Walther

 

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In the perfect world they would randomly be selected, the question is rather why do you want two equal MX record preferences? Are you thinking round robin or something?

[ August 26, 2004, 10:55 PM: Message edited by: Henrik Walther ]

(in reply to Danofre)
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RE: MX Record Preference - 26.Aug.2004 8:38:00 PM   
Danofre

 

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From: NJ
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I have 2 mail servers
mail.cmdnewyork.com with MX set at 10
cmd6.cmdnewyork.com MX set at 100

mail works fine
cmd6 seems to but wont send or receive mail from AOL or yahoo. Error 4.4.7

DNS is configured the same, etc.
Hasn't anyone else out there setup 2 mail servers in the same company? How come no one can help? [Frown]

(in reply to Danofre)
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RE: MX Record Preference - 26.Aug.2004 9:52:00 PM   
chuff@cchk.org

 

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From: Ky
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Do both mail servers have reverse DNS as well?

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RE: MX Record Preference - 26.Aug.2004 10:19:00 PM   
chuff@cchk.org

 

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Disregard my post as I failed to realize you supplied enough info to look for myself. I thought that one of your servers might be missing a reverse DNS entry, which doesn't appear to be the case, and causing mail to certain domains to fail for one particular server. I don't have any other ideas at this time. Sorry!

(in reply to Danofre)
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RE: MX Record Preference - 26.Aug.2004 10:25:00 PM   
Danofre

 

Posts: 80
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From: NJ
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Yeah I did all the standard checks.
SPF is not needed.
This is frying my brain.

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RE: MX Record Preference - 26.Aug.2004 10:28:00 PM   
chuff@cchk.org

 

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Are you using a Watchguard Firebox firewall by any chance?

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RE: MX Record Preference - 26.Aug.2004 10:58:00 PM   
Danofre

 

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We have a PIX frewall and both servers are behind it.

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RE: MX Record Preference - 27.Aug.2004 6:03:00 PM   
chuff@cchk.org

 

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From: Ky
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Have you checked that Pix to make sure the servers are in the same access-lists or that something weird isn't going on there? Just a thought...

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RE: MX Record Preference - 27.Aug.2004 7:45:00 PM   
koggen

 

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Joined: 31.Oct.2001
From: Göteborg - Sweden
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Looks like you have used a SMTP screening feature of the PIX firewall. I telneted to the SMTP port of your servers, and from the ouput it sure looks like that's the case. There's a MS KB article on the subject, but I can't find it for the moment. Try to disable the SMTP screening capability of the firewall and see if that helps.

Good luck!

// Johan

[edit] found the KB article here KB320027 - XCON: Cannot Send or Receive E-Mail Messages Behind a Cisco PIX Firewall. The response listed in the KB looks exactly like the response I got using telnet.

[ August 27, 2004, 07:46 PM: Message edited by: Johan Sandqvist ]

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