I have an email mail server running on our LAN, it takes emails form various ISPs and sends then to users on the LAN. I want to be able to access this email server via IMAP from the internet so I can see my emails when out of the office. I can set a rule which allows web traffic to a web server but when I use the same type of rule I cannot get to the email server. I redirect IMAP4 requests on port 143 to the LAN IP address where the email server is. I have spoken to the manufacturers of the email server and say that this is possible with their software and no other settings need to be changed. I use mail2web.com to look at my server but I don't get any feedback as to what the error is, just that there is an error. Can anyone help? Perhaps any software which might indicate where the error is.
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