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josef

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Just deployed Kerio and i am seeing some SMTP servers make more than 1 SMTP delivery connection when sending to multiple users on the same server, not all but some do this.

eg: 3rd party email via their server sends an email to a user on my kerio mail server, they also in the same email either TO or CC put a alias email (or group email) that the individual is part of as well on our server

To: user1@domain.com, group1@domain.com (group1@domain.com -> goes to user1<_at_>domain.com and others)

the 3rd party mail server via the logs on keroi makes 2 smtp sends, 1 for user1@domain and 1 for group1<_at_>domain) and the SMTP id is of course unique since its a different SMTP delivery request. Well user 1 gets this email twice in their inbox.

this does not happen from MOST SMTP mail servers, but it happening more often now.

On my old mail server the server i checked, and it was seeing the same thing, unique delivery requests, BUT it was smart enough to know they were the same, and 1 was already delivered to user1, so no need to ALSO deliver the group1 email to that user as well.

How can i get kerio configured so my users dont get multiple copies of emails from the outside world when some 3rd party mail servers make individual connections for each sending to/cc address.

some of my users belong to multiple email groups, and if someone which happens often sends to lets say 5 groups the user belongs to they get the message 5 times in their inbox.

PLEASE HELP!
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