Cannot recieve external emails

We have a network of around 30 people, they can all send and recieve emails internally, they can also send emails externally but cant recieve external emails..

any help would be great!
MIKEDUNN1878Asked:
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oldhammbcCommented:
do you have a fixed external IP address? Im wondering if after the BT issues they have given you a different external IP address?? Can you try going to https://www.testexchangeconnectivity.com/ and doing the email test at the bottom? it should give you some info about weather the server can connect to your email server etc.

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oldhammbcCommented:
are your MX records setup correctly on your domain so email comes though to your incoming mail server??
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Alan HardistyCo-OwnerCommented:
Is port 25 open on your firewall inbound and is the firewall forwarding port 25 to your Exchange Server?

As mentioned above - check your MX records on www.mxtoolbox.com and make sure they are pointing to the right IP Address.
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MinoDCCommented:
Do You have created the rule to your firewall / router so that the internal IP address of your SMTP server is published externally with a public address (NAT Rule).

The public DNS for your domain SMTP was created, and is it correct?
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MIKEDUNN1878Author Commented:
yes they are both ok, sorry i should of said, we have had no problems for a few years.. its not a new network.. this just happened yesterday.. I dont know if you heard about the BT meltdown yesterday.. it hit us and once the internet came back up here we could no longer recieve emails which seems odd??
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Alan HardistyCo-OwnerCommented:
Check the Authentication Settings on the SMTP Virtual Server and make sure you have Anonymous Authentication enabled.  This kills inbound traffic very quickly if not enabled.
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Alan HardistyCo-OwnerCommented:
What was the solution?
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