Exchange 2010

Last night we lost power and so everything was down for about 15 min. I powered everything back up and now we can not receive or send emails externally.
Dawin DaiseSr. Windows Systems AdministratorAsked:
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Gopi RajuSystem EngineerCommented:
Are you able to receive/send mails internally, if not try restarting the exchange related services. Also try clearing the message queue.
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Dawin DaiseSr. Windows Systems AdministratorAuthor Commented:
I can send and receive emails internally just not externally. Tried restarting all Exchange services as well.
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Arif KhanSystem AdministratorCommented:
Are you getting any bounce back msg, pst here.
Do you see if mails are storing in queue?
Did you try to send mail using owa?
Are you using any third party spam device or relay?if yes, then first verify where is mail getting stuck? Check your public DNS ip and ensure no one made any change
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viktor grantExchange ServersCommented:
Hi,

Could you check if you have any events regarding mail flow? Check the event viewer.

Cheers
Viktor
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Jose Gabriel Ortega CastroCEOCommented:
You need to check all the mail flow.
1st The reason why you can send emails internally is because emails never leave the exchange server.
2nd If you can't send, like at all, it's because you need to check the antispam (if any) and the firewall (ports and rules).
3rd You need to make sure that "Information store" and "the Transport" service from the exchange are up and running.
4th Check that your internal DNS is working properly and it's resolving the IP internally and externally.
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pgm554Commented:
This SBS?
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Alan HardistyCo-OwnerCommented:
Did your router lose its configuration and ports aren't open that were open before?

Test on www.canyouseeme.org from the server and test port 25 to see if it is open.  If not, sort the firewall and then test mail-flow.
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Dawin DaiseSr. Windows Systems AdministratorAuthor Commented:
Then previous admin never saved the changes on the Watch Guard firewall in memory.
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