[Dshield] SMTP DNS record question

David Hart DavidHart at TQMcube.com
Mon Jan 12 17:47:51 GMT 2004


On Mon, 2004-01-12 at 12:07, Richard Roy wrote:
> That isn't the customer.  Sorry, that is the place I did the querry
> instead.
> If that was unclear I am sorry.
> The domain was vdh.state.vt.us 
> Which returns:


Well I can connect to the mail server via all three mx records:

vdh.state.vt.us.        86400   IN      MX      10 mx2.state.vt.us.
vdh.state.vt.us.        86400   IN      MX      10 mx0.state.vt.us.
vdh.state.vt.us.        86400   IN      MX      10 mx1.state.vt.us.
mx0.state.vt.us.        86400   IN      A       159.105.23.194
mx1.state.vt.us.        86400   IN      A       159.105.23.130
mx2.state.vt.us.        86400   IN      A       170.222.64.130

> 
> Domain Type Class TTL Answer vdh.state.vt.us. MX IN 86400
> mx1.state.vt.us. [Preference = 10] vdh.state.vt.us. MX IN 86400
> mx2.state.vt.us. [Preference = 10] vdh.state.vt.us. MX IN 86400
> kraken.vdh.state.vt.us. [Preference = 0] vdh.state.vt.us. MX IN 86400
> mx0.state.vt.us. [Preference = 10] state.vt.us. NS IN 86400
> ns2.state.vt.us. state.vt.us. NS IN 86400 ns1.state.vt.us.
> kraken.vdh.state.vt.us. A IN 86400 159.105.134.230 mx0.state.vt.us. A IN
> 86400 159.105.23.194 mx1.state.vt.us. A IN 86400 159.105.23.130
> mx2.state.vt.us. A IN 86400 170.222.64.130 ns1.state.vt.us. A IN 86400
> 159.105.23.130 ns2.state.vt.us. A IN 86400 170.222.64.130 
> 
> 
> As I said, 3 separate MX records all with the same preference.  I
> thought it was odd and might be part of the problem, I'll admit I could
> be way off base, but I thought that multiple MX records had to have
> different preferences.
> 
> 
> 
> -----Original Message-----
> From: list-bounces at dshield.org [mailto:list-bounces at dshield.org] On
> Behalf Of David Hart
> Sent: Monday, January 12, 2004 9:58 AM
> To: General DShield Discussion List
> Subject: Re: [Dshield] SMTP DNS record question
> 
> 
> On Mon, 2004-01-12 at 11:42, Richard Roy wrote:
> > I am working to debug why I am having difficulties sending to a 
> > customer email.  I have implemented a new firewall, and spam blocker, 
> > and have yet to be able to point to either as the root of the problem.
> 
> > So for grins, I went to www.dnsstuff.com and did a querry on them.  
> > They have 3 MX records, MX0, MX1, MX2 all with different hosts and IP 
> > addresses.
> 
> I show just one MX (mail.dnsstuff.com) which, in turn, is handled by a
> spam handler, declude.com which, in turn, uses imail, which in turn is
> one terrible MTA which, in turn, is probably the problem ;-)
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