IMAP testing can be a little tough, especially when you are on a production server. Here's the first things I'd do to make sure IMAP connectivity is working OK: Run a Telnet from a Telnet Client to ports 143 and 993. 143 is your TLS port and 993 is for SSL IMAP connections: [crayon-5df03ebe96dfd907421625/] You can use your public IP. You're looking for a black box or a banner that you've set up with a virtual service listening on the port. If you get a denied connection there might be … [Read more...] about Exchange 2013: Test IMAP Connectivity
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