DNS report, connecting to mail servers |
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Ronny 
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 Topic: DNS report, connecting to mail serversPosted: 15 June 2004 at 8:11am |
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I am getting some phonecalls from some external users that have problems sending us email.
When I check DNS and MX records I get the following error msg:
(I am running spamfilter ver 2.9.1.357)
This is from http://www.dnsreport.com
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ERROR: I could not complete a connection to any of your mailservers!
xxx.xxx.xxx.xx: Connection closed before I received all my data (state 8). Your mailserver disconnected before it was done! This may be the result of a non-RFC-compliant mailserver or anti-spam program. notesmta.nera.no: Connection closed before I received all my data (state 8). Your mailserver disconnected before it was done! This may be the result of a non-RFC-compliant mailserver or anti-spam program. If this is a timeout problem, note that the DNS report only waits about 30 seconds for responses, so your mail may work fine in this case but you will need to use testing tools specifically designed for such situations. -------------------------
Can their not beeing able to send me mail be related to the spamfilter at all?
(they are not beeing caught by the filter...)
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LogSat
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Joined: 25 January 2005 Location: United States Status: Offline Points: 4106 |
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Posted: 16 June 2004 at 10:27pm |
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Ronny, If you check SpamFilter's activity log while dnsreport performs its test, you'll see something like the following: 06/16/04 22:16:13:274 -- (988) Connection from: 69.2.200.182 - Originating country : United States The bolded entry is most likely what's causing their test to fail. They're trying to send an email not to our domain, but to our IP address in the form postmaster@[209.26.140.4]. While that is "legal", several SMTP servers (ex Post.Office) have bugs in that they allow addresses in that format to bypass all security settings and become open relays. Many spammers use the above trick on such servers and use them as open relays to spam. SpamFilter has a list of "allowed domains". 209.26.140.4 is not in that list, so that recipient is rejected. SpamFilter will not allow the IP to be used instead of the domain name by default to prevnt spammers abuse your server in case it's vulnerable as above described. You may enter the entry [aa.bb.cc.dd] in your local domains if you wish to receive emails in that format, even though we believe that no legitimate emails will usually have that format. Roberto F.
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Ronny
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Posted: 17 June 2004 at 4:00am |
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Thank you, I am happy with that :)
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