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Can't telnet to exchange 2007 externally

Sid_F asked
Last Modified: 2012-05-07
I have inherited a 2008 server sbs running exchange 2007, I can telnet to the machine from the local lan and all my firewall rules check out for external access, but I cannot telnet externally and hense cannot send mail, my receiving connectors seem to be ok.

What checks should I run though, I can send out mail fine
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