I've solved this issue, it seems as if our ISP was blocking port 25 and this is apparently standard practice for ISP's, you actually have to call their technical support guy's to open up for your mail server.
It would have been nice to know this before spending a week troubleshooting this.
Good...
Did this work? I'm having exactly the same problem...
I don't think it's the firewalls because I've tried removing the ACL from the interface and still doesn't work.
(I have still only applied 101 in the config)
You can connect to the SMTP server from the local LAN but not from any outside...
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