Cant Send or Recieve Exchange Email Externally

Hi I am running an exchange server 2010. Today we stopped receiving email from outside and we cannot send email outside. Also our VPN has stopped working.  There are several security updates pending going to run those and see if it helps

Please Advise.
cbd1012Asked:
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TolueneCommented:
If your VPN is pointed to your FQ.domain name, then I would suggest checking DNS and your MX Records.  If the MX records were changed and you use that name for your VPN and it's pointed somewhere else, then that could cause your problem.
mlehnertzCommented:
Make sure the DNS servers for the domain are responding.
cbd1012Author Commented:
How Do i do that.. should i check DNS server on the server itself or DNS with the hosting provider .. we have a website with the same name and it is responding. So does that mean the dns server is responding ?
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abdulalikhanCommented:
Check your domain MX by going to www.mxtoolbox.com website and see if your ip is pingable [if allowed from outside] or try to telnet on the MX IP on port 25 from outsite.
mlehnertzCommented:
It is still possible to browse a web site at www.domain.com even when the DNS servers are not functioning due to the caching of DNS.  It's a matter of timing surrounding the DNS lookups.

Since it sounds like you are at a remote location (you say the VPN doesn't work), the simple way to test DNS is to jump to a command prompt and type "nslookup host.domain.com".  Replace "host.domain.com" with the name of your mail server - or any WAN facing server for that matter.  You always want to test DNS from outside of the network.

I'd verify that your DNS is working properly before doing anything else because it sounds like you have a DNS issue.
cbd1012Author Commented:
Hi Guys,

So i ran all the updates and mail is flowing and the VPN is working. I guess microsoft is serious about their security updates.

Thanks for your help

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cbd1012Author Commented:
My solution solved the problem.
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