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Invalid MX Record

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Daniel_S View Drop Down
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    Posted: 11 December 2006 at 10:37am

Good Morning,

Starting in the last four days or so,  my SPAMFILTERISP server has started rejecting almost every email it looks at.  The reason it gives for blocking these emails is ...

Your domain logsat.com does not have a valid MX DNS record. Disconnecting...

Has anyone else seen this problem or might have any suggestions???

Thanks Dan S

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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2006 at 11:08am
Dan,

Did you make any changes to your environment? That error is very unusual, as you SpamFilter sees incoming emails coming from logsat.com's email addresses (which of course can't be right).
Can you post a section of your SpamFilter's activity logfile showing a few emails being rejected?
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Daniel_S Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2006 at 1:54pm

Here is a section from the logfile.  Currently, I have turned off filtering by Invalid MX record, and people appear to be recieving their email messages again.  The current reason for rejecting of emails, does not always referrence the logsat.com domain name.  (I.E. If the message being rejected is from the xyz domain, then reason for rejecting is ...Your domain xyz.com does not have a valid MX DNS record. Disconnecting...  But if the message is from xxxxx.com the the reason for rejecting is ... Your domain xxxxx.com does not have a valid MX DNS record. Disconnecting...)

12/10/06 23:59:17:028 -- (28572) Running TTerminateIdleThreads - SFTC=0 - SFFC=0
12/10/06 23:59:17:028 -- (28992) Blacklist cache - starting cleanup
12/10/06 23:59:17:028 -- (28992) Blacklist cache - removed IP 205.177.90.143 from limbo during cleanup
12/10/06 23:59:17:028 -- (28992) Blacklist cache - removed IP 70.105.50.105 from limbo during cleanup
12/10/06 23:59:17:028 -- (28992) Blacklist cache - removed IP 76.164.207.198 from limbo during cleanup
12/10/06 23:59:23:684 -- (29176) Connection from: 151.37.170.191  -  Originating country : Italy
12/10/06 23:59:24:450 -- (29176) No Data Received
12/10/06 23:59:24:450 -- (29176) Disconnect
12/10/06 23:59:30:684 -- (27020) Connection from: 121.97.251.11  -  Originating country : Philippines
12/10/06 23:59:30:981 -- (27020) No Data Received
12/10/06 23:59:30:981 -- (27020) Disconnect
12/10/06 23:59:35:778 -- (29512) Connection from: 71.104.207.39  -  Originating country : United States
12/10/06 23:59:36:512 -- (29512) Resolving 71.104.207.39 -
12/10/06 23:59:36:575 -- (29512) - Invalid MX record -
12/10/06 23:59:36:575 -- (29512) 71.104.207.39 - Mail from:
nicholas@xxxxx.biz To: dgarza@xxxxx.com will be rejected
12/10/06 23:59:37:200 -- (29512) Created thread (29752) to add email to quarantine
12/10/06 23:59:37:247 -- (27660) Time to add Msg to Bayes corpus:0
12/10/06 23:59:37:247 -- (29752) EMail from
nicholas@xxxxx.biz to dgarza@xxxxx.com was received and quarantined. Size: 25 KB, 25600 bytes
12/10/06 23:59:37:450 -- (29512) Blacklist cache - Added 71.104.207.39 to limbo
12/10/06 23:59:37:653 -- (29512) SFDB - Added 71.104.207.39 - Response: Error=0
12/10/06 23:59:37:653 -- (29512) Disconnect
12/10/06 23:59:37:997 -- (28732) Connection from: 71.253.51.188  -  Originating country : United States
12/10/06 23:59:38:512 -- (28732) Resolving 71.253.51.188 -
12/10/06 23:59:38:590 -- (28732) - Invalid MX record -
12/10/06 23:59:38:590 -- (28732) 71.253.51.188 - Mail from:
robert@xxxxx.biz To: brock@xxxxx.com will be rejected
12/10/06 23:59:40:340 -- (28732) Created thread (28936) to add email to quarantine
12/10/06 23:59:40:356 -- (28936) EMail from
robert@xxxxx.biz to brock@xxxxx.com was received and quarantined. Size: 25 KB, 25600 bytes
12/10/06 23:59:40:387 -- (27660) Time to add Msg to Bayes corpus:0
12/10/06 23:59:40:512 -- (28732) Blacklist cache - Added 71.253.51.188 to limbo
12/10/06 23:59:40:731 -- (28732) SFDB - Added 71.253.51.188 - Response: Error=0
12/10/06 23:59:40:731 -- (28732) Disconnect

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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2006 at 7:46pm
Dan,

Can you please make sure the DNS server(s) that SpamFilter is using, is actually working correctly? You can verify this by using NSLOOKUP from a command prompt on the server with SpamFilter. From an MSDOS prompt, please issue these commands (in bold). Instead of the entries in red, please use the IP of the DNS server SpamFilter is using, and one of the domain names that is failing, in the sample below. If the DNS server is working, you should get a reply containing the list of MX record9s) for the domain. If not, either the DNS server is not working correctly, or the domain is misconfigured when it comes to their MX record.

C:\>nslookup
Default Server:  ns2.netwide.net
Address:  192.168.26.10

> server 209.26.140.2
Default Server:  ns1.netwide.net
Address:  209.26.140.2

> set type=mx
> logsat.com
Server:  ns1.netwide.net
Address:  209.26.140.2

logsat.com      MX preference = 0, mail exchanger = mail2.netwide.net
mail2.netwide.net       internet address = 209.26.140.4
>
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote LogSat Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2006 at 7:47pm
Dan,

Can you please make sure the DNS server(s) that SpamFilter is using, is actually working correctly? You can verify this by using NSLOOKUP from a command prompt on the server with SpamFilter. From an MSDOS prompt, please issue these commands (in bold). Instead of the entries in red, please use the IP of the DNS server SpamFilter is using, and one of the domain names that is failing, in the sample below. If the DNS server is working, you should get a reply containing the list of MX record9s) for the domain. If not, either the DNS server is not working correctly, or the domain is misconfigured when it comes to their MX record.

C:\>nslookup
Default Server:  ns2.netwide.net
Address:  192.168.26.10

> server 209.26.140.2
Default Server:  ns1.netwide.net
Address:  209.26.140.2

> set type=mx
> logsat.com
Server:  ns1.netwide.net
Address:  209.26.140.2

logsat.com      MX preference = 0, mail exchanger = mail2.netwide.net
mail2.netwide.net       internet address = 209.26.140.4
>
Roberto Franceschetti

LogSat Software

Spam Filter ISP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Daniel_S Quote  Post ReplyReply Direct Link To This Post Posted: 12 December 2006 at 8:53am

Good Morning,

It appears to have been the DNS server I was pointed to.  I did like you suggested, and the DNS server did not respond correctly.  So I changed the DNS servers to one I knew were working correctly, and the problem cleared up

Thanks for your help

Dan S

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