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read receipts in the middle of the night

Our users are coming in to the office in the morning with unexplained 25+ read receipts relating to old meetings. The time the read receipts arrive in the mailbox appear to be 1am-3am when clearly nobody would be in their mailbox. Any idea what may cause this, sounds to me like some sort of maintenance task. I think some users reported that old meetings also vanish from their calendars, so say a meeting from 8 months ago vanishes in line with the phantom read receipts. Any theories welcome. Exch 2010 by the way.
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pma111
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pma111
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1 Solution
 
pma111Author Commented:
Should have said "not read receipts" or not accepted type messages
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Does this happens every now and then ... what i can think of is that if today you send me an email with Read receipt and i have a Retention policy to delete any email after X days and when its processed by the policy its sending a read receipt to the Sender.

Is this large number of Read receipts everyday ?
Can you please tell what type of response do you get is that an email or what exactly ?

Check the schedule of the tasks that run .... one i know is the Online Maintenance on the Mailbox that runs every day around Midnight to 4:00 AM i guess.

- Rancy
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pma111Author Commented:
Every now and then
Yes its a not read or not accepted email
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pma111Author Commented:
>>what i can think of is that if today you send me an email with Read receipt and i have a Retention policy to delete any email after X days and when its processed by the policy its sending a read receipt to the Sender.


Not to sure what you mean here.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
In Exchange 2010 you have something called as "retention policies and tags" this allows you to manage emails within users mailbox. Not sure if this process is doing this.

If the response if after a specific time check what all might cause this ? Any Retention or something.

- Rancy
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