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Email not delivered.

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=5773
Printed Date: 26 December 2024 at 10:20am


Topic: Email not delivered.
Posted By: nadnus123
Subject: Email not delivered.
Date Posted: 29 August 2006 at 10:17pm

Hello Folks,

This is Nadeem Ahmed, I get an error message, cannot deliver email to 557. Your domain does not have a valid DNS MX record. Disconnecting...If somebody in the forum could explain to me about this and what does 557 number denote, I would be very thankful.

Regards,

Nadeem Ahmed.



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nadnus123


Replies:
Posted By: LogSat
Date Posted: 29 August 2006 at 11:01pm
Nadeem,

The email is being rejected most likely because the domain specified in the email address does not have a valid MX record specified in the DNS. Anti-spam products may reject emails if a valid MX record is not present.


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Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: nadnus123
Date Posted: 29 August 2006 at 11:25pm

Hello Roberto,

Thank you very much for the response.

Just wanted to know that what do I have to do in order to resolve this.

Thanks,

Nadeem Ahmed.



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nadnus123

Posted By: nadnus123
Date Posted: 29 August 2006 at 11:28pm

Hello Roberto,

Could you please explain how do I go about to resolve this problem.

Thank you,

Nadeem Ahmed.



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nadnus123

Posted By: sgeorge
Date Posted: 30 August 2006 at 9:29am
Hi Nadeem,

Let me jump in... maybe I can help.  Here's how you can find out if the sender's domain has a valid MX record..

  • Go to http://www.dnsstuff.com/ - http://www.dnsstuff.com/
  • In the top-right box, called DNS lookup, type in the sender's domain; from the drop-down box, choose "MX"
  • Click the button and see the results.
If you get a message like this, then they do not have an MX record:
No MX records exist for sender-domain.com
Otherwise, you'll get a list of their MX entriy(ies).


Also, it's helpful to know why SpamFilter allows you to block email from domains without MX records (btw, that setting can be turned off).

Should anyone try to send a message to, say, mydomain.com, the first thing their smtp server does is a lookup for MX record(s) for mydomain.com.  The results give the sending server the means to determine where (what i.p.) the message can be sent to.  If no MX results are returned, the sending server may a.) guess or b.) give up. 

It's a poor configuration when a domain that sends email doesn't have a MX record.  It makes sending email to the domain troublesome; it also makes them look suspiciously like spammers - after all, spammers are probably the people solely concerned with sending email and not worried about being able to receive it.

Stephen

Posted By: nadnus123
Date Posted: 30 August 2006 at 9:44pm

Hello Stephen,

Thanks for replying, Now I have got one more problem. When I try to send an email, I get an error message "FE-28: Cannot deliver email to 550 5.1.1 User unknown". I would be glad, if someone could help me in resolving this error.

Thanks,

Nadeem Ahmed.



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nadnus123


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