Question : SBS 2007 not recieving external mail

Hi,
  My SBS 2007 box is not recieving any external mail, internal mail is fine, nameservers are working (mail.company.tld is resolving to the correct IP address), message tracker shows no messages recieved in 6+ hours, despite numerous tests sent.

I have rebooted and seen an instance on reboot of Event ID 12014
    "Microsoft Exchange couldn't find a certificate that contains the domain name mail.domainname.com in the personal store on the local computer. Therefore, it is unable to offer the STARTTLS SMTP  verb for any connector with a FQDN parameter of mail.domainname.com.
         Verify the connector configuration and the installed certificates to make sure that there is
         a certificate with a domain name for every connector FQDN."

I don't think this is the cause as I have seen it before today. Any ideas/help greatly apprediated.

Gaz

Answer : SBS 2007 not recieving external mail

check connection by telnet from outside to your mailserver (you can also try to connect by telnet locally). If SMTP service is not responded from outside and from inside yes check firewall config.