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Some MAil not being delivered

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2 replies

by cginnitty

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I administer a W2k server running exchange 5.5 SP4. Lately some people have compalined that messages sent to my domian have bounced back. There is no clue in the bounce that I have seen why it occured.
Here is one of the bounces
From: postmaster@mail.hotmail.com

>To: xxxxx@hotmail.com

>Subject: Delivery Status Notification (Failure)

>Date: Sun, 18 Jan 2004 17:57:25 -0800

>

>This is an automatically generated Delivery Status Notification.

>

>Delivery to the following recipients failed.
xxx@XXX.com

Ive noticed that I have no Reverse DNS entries for my MX records. Could this be the cause of the problem?

2 replies

by oldefar

A lack of reverse DNS may cause the problem, but it may not be one you can fix unless your ISP has granted you that authority.

1) Go to https://www.zoneedit.com/lookup.html and enter in the DNS section your domain name (ex. xxx.com) and select the optional "Select Record Type" Authority (SOA).

2) If it comes back with your DNS server as the primary NS, then you can add the reverse DNS records to it. See RFC 1536 abd 1537 to avoid some common mistakes.

3) If it comes back with you ISP DNS server as the primary NS you should do a reverse DNS search. Enter the IP address of your MX server and see if you get a valid domain response.

4) If not, contact your ISP account manager to get the reverse DNS problem resolved. If so, contact your ISP account manager and see about having the timer settings set properly (see RFC 1537).

by mark

The reverse DNS needs to be addressed and may cause the issue depending on the hotmail server. I also have heard that HotMail was blocking port 25 on their service and this was causing alot of bounced mails. You might search the Internet about this for more information. Do you get bounces from other ISPs or are they primarily hotmail accounts?

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