I have a user that is reporting delayed email during the day and I can't find any issues in the log for that user? She is claiming mail is intermittently not being delivered for long periods. I logged into her account and watched it for issues but could not reproduce?

Has anyone seen account delivery delays similar to this?

TIA - Mike
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Release 5.0.16_GA_2921.MACOSXx86, Zimbra, Inc.
MACOSXx86 NETWORK edition