Hi Michael,
We released 16.3.6821 and 15.7.6821 this morning to mitigate issues that were reported in 16.3.6816 and 15.7.6816. See release notes for 16.3.6821:
- IMPORTANT: Fixed issue where TCP connections are being prematurely closed under certain circumstances, causing a variety of issues.
- Efficiency: Prevent potential memory leaks with how TCP connections were being improperly disposed.
Please update your installation to 16.3.6821 and let us know if you continue to see the spike in IMAP sync time.
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com