confused about "does not have a valid MX DNS record" |
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keizersozay 
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Joined: 26 January 2005 Location: United States Status: Offline Points: 77 |
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 Topic: confused about "does not have a valid MX DNS record"Posted: 09 November 2004 at 8:58am |
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Yesterday I upgraded to the latest pre-release version 191. Everything has been going great so far, I have just noticed one thing I can not figure out. When someone from say person@mail.tandemfs.org emails someone on my system, SpamFilter kicks it back saying said: 557 Your which seems correct because when I do an nslookup for the mx record at mail.tandemfs.org it does not have one. However when I reply to this address using my yahoo account it delivers (??) and the person is able to reply to me! I though I understood dns enough, but I don't understand how it works from yahoo. Thanks, |
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kspare
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Joined: 26 January 2005 Location: Canada Status: Offline Points: 334 |
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Posted: 09 November 2004 at 10:47am |
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You may have some dns issues...I can do a mx lookup and it works fine. > set type=mx Non-authoritative answer: mail.tandemfs.org internet address = 216.12.20.97 |
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keizersozay
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Posted: 09 November 2004 at 11:01am |
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Yes, I get the same result when I look up the mx record for tandemfs.org, but the email comes from user@mail.tandemfs.org, not user@tandemfs.org I was under the impression that the domain mail.tandemfs.org needs to have an mx record, not just the domain tandemfs.org...? Thanks,
Default Server: x.com Address: x > set type=mx > tandemfs.org Server: x.com Address: x Non-authoritative answer: tandemfs.org MX preference = 0, mail exchanger = mail.tandemfs.org mail.tandemfs.org internet address = 216.12.20.97 > mail.tandemfs.org Server: x.com Address: x tandemfs.org primary name server = ns1.lunarpages.com responsible mail addr = alerts.lunarpages.com serial = 2004090703 refresh = 14400 (4 hours) retry = 7200 (2 hours) expire = 3600000 (41 days 16 hours) default TTL = 86400 (1 day) >
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kspare
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Joined: 26 January 2005 Location: Canada Status: Offline Points: 334 |
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Posted: 09 November 2004 at 11:05am |
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The only thing I can think of is that because no mx record is present, it looks for an a record. And it sends to that.
> set type=a Non-authoritative answer
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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: 09 November 2004 at 6:04pm |
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Kevin is correct. The domain *should* have a proper DNS MX record. Some forgiving mail servers will attempt to send an email directly to the host name in the domain, mail.tandemfs.org in your case, if no MX record exists. That is why yahoo and other servers will be able to send an email to it.Roberto F.
LogSat Software
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