Cannot telnet to IMAP server

OK, i am deeply confused:

i have set up an exchange server and enabled all ports on firewall. i am trying to set up remote clients with IMAP, i can set up POP3 but not IMAP. Both POP3 and IMAP are set up with same settings but for some reason if i try the following command on a remote machine:

telnet mail.**********.com 110

it lets me through straight away saying  +OK the microsoft exchange POP3 service is ready.

if i try:

telnet mail.**********.com 143 i get the following (after lots of waiting):

...Could not open connection to the host, on port 143: Connect Failed

i can succefully run both these on the server itself using Localhost instead of FQDN, and i can run both on a local machine using the local name of the server instead of the external name.

I have tried disabling Firewall (both ends), Antivirus, and i have double, triple and quadruple checked the firewall settings to make sure port 143 is open and it is.

it seems there is something blocking it but I have no idea what.
I am using exchange 2010 BTW
please help!
catomaxAsked:
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Mkris9Connect With a Mentor Commented:
what firewall are you using ? have you checked firewall logs for rejected / blocked requests ?
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catomaxAuthor Commented:
Hi Mkris,
I am using a Sonicwall TZ 100 series firewall, checked the logs and there is nothing about the attempted connections at all.

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catomaxAuthor Commented:
Thanks for at least showing an interest in the question, managed to solve it eventually.
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attbrowningCommented:
I am having the same issue with Exchange 2007.. if you could please relate what your solution was I'd appreciate it.
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