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http://resources.intenseschool.com/five-most-common-dns-issues-and-how-to-resolve-them/
May 28, 2015 · While there are numerous reasons for DNS problems, Chris Gonyea, product manager of traffic management at Dyn, said that the five most common DNS issues are the following: High TTL (time to live) values on critical DNS records that result in painful propagation waits and downtime when trying to move traffic from one server to another;
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/mail-flow-best-practices
Feb 07, 2020 · In Office 365 mail flow, there are several components of DNS that are particularly important for email authentication and delivery: MX records, SPF, DKIM, and DMARC. MX (mail exchanger) records provide an easy way for mail servers to know where to send email. You can think of the MX record as a type of postal address.
https://serverfault.com/questions/812852/dns-problems-after-switching-to-custom-nameservers
DNS problems after switching to Custom nameservers. Ask Question Asked 3 years, 4 months ago. ... Failed to deliver email for SOA RNAME of status2.com ... it can cause odd behaviour including some people not being able to access your domain. Generally this is saying that you've changed the nameservers at the parent level ...
https://www.webhostinghub.com/help/learn/email/troubleshooting/problems-sending-mail
Jul 14, 2015 · Troubleshooting Problems when Sending Email; Troubleshooting Problems when Sending Email ... If it has expired, you must renew the domain with your registrar, and point back to our Nameservers. Then within 24 hours it will propagate back ... I read through the two scenarios of what could cause sending issues to occur and neither seemed to apply ...
https://status.niner.net/tag/nameservers
Nov 15, 2019 · In fact, leaving ns3.niner.net in the list of nameservers authoritative for your domain will cause a slight decrease in performance, which is why we are asking you to remove it. If you have any questions about this please reply to the email you will receive, or contact NinerNet support. Thank-you.
https://mxtoolbox.com/problem/smtp/smtp-reverse-dns-resolution
More Information About Smtp Reverse Dns Resolution. We were unable to perform a reverse lookup (PTR) on the IP Address of your mail server. This is a problem because many organizations will not accept email from a server without a PTR record.
https://forums.cpanel.net/threads/nameserver-setup-questions.649513/
Mar 20, 2019 · How to Set Up Nameservers in a cPanel Environment - cPanel Knowledge Base - cPanel Documentation You should not have to edit the DNS zones after each account is created as long as you configure the default name servers in WHM's Basic WebHost Manager Setup interface. It's acceptable to use NS1 and NS2 for multiple domains. Thank you.
https://manage.accuwebhosting.com/knowledgebase/2053/Everything-you-should-know-about-IIS-Application-Pools.html
Therefore, if one website starts having issues, it could cause frequent application pool recycles that could impact all other. To be in safe side, you can assign one application pool per website. Although, it's not necessary in all cases. Following are some of the things, you can consider:
https://docs.microsoft.com/en-us/office365/enterprise/external-domain-name-system-records
Oct 21, 2019 · We've updated our SPF records guidance at the end of this article. The important thing to remember is that you can only have a single SPF record for your domain. You can have multiple MX records; however, that can cause problems for mail delivery. Having a single MX record that directs email to one mail system removes many potential problems.
https://mxtoolbox.com/problem/http/http-dns
What can you do? Try running a DNS Lookup on your domain to see if there are any issues with your DNS servers. If you have a monitor configured on MxToolbox, you can perform the lookup on our server. You can then view the monitor's history to see when and what the exact cause of the problem might be.
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