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By glmartin56 ·
What support, network traffic, additional security issues and configuration changes are involved when enabling IMAP4 to an Exchnage 5.5 server?

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by tony.colgrove In reply to IMAP4

If you have a firewall and want to allow access through the firewall you need to open port 143 for IMAP.
Also the Exchange Alias must be the same as the NTUserID for authentication to work.
Make sure you allow relaying through your IMS for authenticated users, and configure the client to authenticate during sends.

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