Wednesday, August 07, 2013, 14:59
Category: Troubleshooting
Solution ID: 00000214
Why am I seeing the error "Deferred: Name server: host name lookup failure" on messages stuck in the mail queue?
This error message occurs when PerfectMail is unable to resolve the domain name of the sending e-mail address in DNS. Most often this occurs when spammers make up ficticious domain names when sending spam.
However, in rare circumstances this can also signal a problem with your local DNS resolution. DNS resolution is required for e-mail analysis and delivery, so there may be a problem affecting your e-mail flow. To see the validation error report go to the "Reports > Server Status" page and look at all of the validation results. There will be lines for each DNS server saying "Querying DNS server" with the results.
Try the following:
1) Reboot your local DNS Server
2) Restart your MTA using the PerfectMail Dashboard
After restarting these services go to the web administrator interface "Tools > DNS Lookup" page. Enter the IP address of the questionable DNS server and lookup names for domains that you would not normally see. The idea is to try and find domain names that would nor normally be cached on your DNS server.
Sometimes we see DNS servers misbehave when performing new lookups. When this happens DNS lookups for cached entries appear to work fine, but new lookups appear to fail. Restarting DNS services appears to fix this problem in the short term.
Tags: DNS, warning, resolution, server, failure, configuration
Link to this article: https://perfectmail.com/kb/deferred_host_name_lookup_failure
Updated: Wednesday, August 07, 2013, 14:59
-- David Rutherford
Last modified: 2017-11-29, 10:04
© 1999-2013 PerfectMail
Comments
31. 新竹 整骨, Sunday, August 04, 2024, 09:03:
https://bogin7.b-cdn.net/re...
Our top-rated sizes range from 00 – 32 to also embrace petite merchandise.
32. 稅務策劃, Monday, August 05, 2024, 03:36:
https://accounting2.researc...
"I said right then I would wear it one day," she recalled.
33. 外燴, Tuesday, August 06, 2024, 12:06:
http://asia-course-222.s3-w...
At as quickly as effortless and refined, this fantastically draped gown is the right hue for a fall wedding.
34. 歐式外燴, Wednesday, August 07, 2024, 20:41:
https://storage.googleapis....
Red Dress has some very beautiful and stylish attire, and they're inexpensive.
35. 苗栗外燴, Wednesday, August 07, 2024, 23:17:
http://catering104.s3-websi...
Weddings could also be very different proper now, depending
on the place you live.
36. 台北會計師, Friday, August 09, 2024, 11:34:
https://ya-4545-21.syd1.dig...
I can assure you that I will never make that mistake once more.
37. 腳底按摩教學, Friday, August 09, 2024, 18:27:
https://tendoncare6.b-cdn.n...
An imported diamond in the tough, the Adrianna Papell
Floral Beaded Gown is a real stunner.
38. 大里按摩, Friday, August 09, 2024, 19:19:
https://drbo6b.s3.us-east-0...
For the mom whose type is sleek and minimal, go for a robe with
an architectural silhouette in her favourite color.
39. 台中按摩推薦, Monday, August 12, 2024, 07:42:
https://drbo9b.s3.us-east-0...
The bride's aunt was just as fashionable in a Reem Acra quantity with lace
and sheer ruffles.
40. 台中頭部按摩, Tuesday, August 13, 2024, 08:51:
https://drbo4b.b-cdn.net/re...
For a seashore wedding ceremony I would put on something a bit more flowy just like the flowery and ruffly clothes above.
240 comments, page 21 of 24 [ « 1 .. 19 20 21 22 23 24 » ]
Add comment