Only in specific implementations. Search the archives. Also, it doesn't have to be MSDNS, it can be Bind, SimpleDNS, or any other dns server that can do cacheing.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Sent: Monday, June 27, 2005 2:02 PM To: [email protected] Subject: RE: [IMail Forum] DNS Failed to connect on Imail 8.05 DNS Blacklist lookups Dan Thanks for the suggestion, but haven't I read on this forum and time again that there was some issue with the W2K3 DNS that when it was turned on, I mail had issues with it??? And bunches of recommendations not to run it. Thanks Mike -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dan Horne Sent: Monday, June 27, 2005 10:10 AM To: [email protected] Subject: RE: [IMail Forum] DNS Failed to connect on Imail 8.05 DNS Blacklist lookups I don't now the answer to your question, but you should definitely consider setting up MSDNS on your Imail server as a local cacheing only nameserver. First of all, this cuts your ISP's name server out of the loop, meaning that if there is a problem with the DNS server YOU can troubleshoot/fix it instead of relying on your ISP to do so (it also means that if your isp's nameserver is on the fritz, your mail still works). Secondly, you are querying your ISP's nameserver multiple times for each email that comes in. Many ISP's frown on this, as even a middling server load can result in a near DOS condition on your ISP's nameserver during peak times. We were notified a couple of years back that we needed to stop using our ISP's nameserver (Charter) in this way or lose our internet connection. Thirdly, it is just a good, common-sense idea. Let your own server do the lookups directly and cut out the middleman. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Sent: Sunday, June 26, 2005 9:55 PM To: [email protected] Subject: [IMail Forum] DNS Failed to connect on Imail 8.05 DNS Blacklist lookups Running Imail V8.05 on Windows 2003 Am receiving "failed to connect" and retries on Blacklist lookups. Only happens on the first incomming mail. While it is being processed, all others that come in during that period, the lookups work fine. Takes it about 20 min to finally fail all the DNS lookups on the first entry before it clears and passes the message thru. Then the next inbound message starts the process all over again. Am using the ISP's DNS server. The Queue manager has "DNS Cache" and "Failed Domain Skipping" both disabled. So, basically everything works great except for the first one to come into the queue. Any ideas Thank you Mike Otte To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
