Andy,
Please view this thread that you posted to:
External Email access problem
as I have explained what my error was and how it has been resolved. If you unable to fix, please let me know the router model etc and I can try to assist you. I will re-iterate that there is nothing wrong with the eUKHosts servers as regards the SMTP - it will be the configuration at your end.
As a simple test to see this is what is causing it, go to a command prompt and enter
Quote:
telnet [YOURDOMAIN] 25
EHLO
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If it comes back with with an error then it is more than likely that your router/firewall is rejecting the ESMTP protocol. Quick definition from Microsoft on ESMTP is:
Quote:
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Enables the server to identify its support for Extended Simple Mail Transfer Protocol (ESMTP) commands
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Thanks
Adam.