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confused about "does not have a valid MX DNS record"

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=4538
Printed Date: 09 May 2025 at 10:25am


Topic: confused about "does not have a valid MX DNS record"
Posted By: keizersozay
Subject: confused about "does not have a valid MX DNS record"
Date Posted: 09 November 2004 at 8:58am

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
domain
    mail.tandemfs.org does not have a valid MX DNS record.
Disconnecting...

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.
Any ideas?

Thanks,
P


Replies:
Posted By: kspare
Date Posted: 09 November 2004 at 10:47am

You may have some dns issues...I can do a mx lookup and it works fine.

> set type=mx
> tandemfs.org
Server:  UnKnown
Address:  10.0.100.2

Non-authoritative answer:
tandemfs.org    MX preference = 0, mail exchanger = mail.tandemfs.org

mail.tandemfs.org       internet address = 216.12.20.97

Posted By: keizersozay
Date Posted: 09 November 2004 at 11:01am

Yes, I get the same result when I look up the mx record for tandemfs.org, but the email comes from mailto:user@mail.tandemfs.org" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - user@mail.tandemfs.org , not mailto:user@tandemfs.org" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - 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,
P

 

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)

> 

 

Posted By: kspare
Date Posted: 09 November 2004 at 11:05am

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
> mail.tandemfs.org
Server:  UnKnown
Address:  10.0.100.2

Non-authoritative answer
Name:    mail.tandemfs.org
Address:  216.12.20.97

 

Posted By: LogSat
Date Posted: 09 November 2004 at 6:04pm
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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