E-mail app no longer works reliably on my Droid Turbo since the recent OS update

The native e-mail app has become unreliable since the recent OS update.  All accounts (corporate, IMAP) have incorrect "Unread" totals.  The corporate exchange account won't send e-mail.  Clearing caches, uninstall/reinstall, all the usual don't bring resolution.

I've switched to third-party e-mail apps pending what I hope will be a fix.

Has anyone else seen this behavior?  Thanks.

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