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Sonicwall Firewall causes IMAP client connectivity issues

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Description
Some customers have reported problems with Blackberry devices, and other IMAP clients, being unable to retrieve messages via the IMAP Protocol.  There are policies on Sonicwall Firewalls that can cause this issue to occur.
Solution
If you are using a Sonicwall Firewall, you will need to ensure that no policies exist to prevent certain IMAP commands.  In the screenshot below you can see that  items 13 through 16 are specifically for Ipswitch IMAP functionality.  These policies were intended to prevent vulnerabilities in older versions of IMail.  The current version of IMail no longer has these issues.   To correct the problem, disable or remove these Sonicwall policies.

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