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We have problem in our Lotus Notes/Domino environment, sometimes users recieve two identical emails (at the same time) from a recipient.

I am not sure, but I think this happens if I send an email to a group of people using email address and someone in that group respond or respond to all. (i.e there is a group in domino directory that can be sent to using an email address like

so even if the email address is to the "internal company" it seem to take a trip to the internet maybe?

anyone else seen this?

We are running latest version on Server and client (8.5.3)

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looks like this question is similar… – Thomas Adrian Feb 10 '12 at 14:35
up vote 1 down vote accepted

A notes.ini parameter was introduced to fix this in Notes 8.5.3

See here Duplicate message received when recipient also member of group being sent to

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You are probably seeing "Duplicate messages are received when 'Exhaustive Lookup' is enabled"

Lotus Notes recipients sometimes receive duplicate messages when "Exhaustive Lookup" is enabled in a Domino server's Configuration Settings document's Router/SMTP > Basics tab.


This scenario can occur if an internal Notes user sends a message to an internal Notes recipient and to a group of which that recipient is a member, depending on the format of the addresses.


Resolving the problem

This issue was reported to Quality Engineering as SPR# KGEW6FVUGB.

To resolve the issue, disable "Exhaustive Lookup" in the Configuration document on the Router/SMTP Basic tab.

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