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Hello fellow Kerio users,

lately one of my Kerio Servers has been intermittenly downloading Mails twice at different intervals.
(suddenly 300 extra mails other days no problem)

The Setup is as following:
Kerio Version 8.3.2
A Mailhoster has a Server online and recieves all mails.
Kerio Connects via POP3 and Downloads the Mails and leaves them there for 7 days (incase something happens)
All Emails go into one Mailbox
I Use Thunderbird IMAP to connect to the local Kerio Server

[10/Feb/2017 17:48:02] Recv: Queue-ID: 589deec2-00001aeb, Service: POP3, From: <incoming mail>, To: <xxx>, Size: 10616, server xxx, user yyy, mailbox zzz, Subject: Need Web Design & Development??

[10/Feb/2017 20:42:51] Recv: Queue-ID: 589e17bb-00001bf5, Service: POP3, From: <incoming mail>, To: <xxx>, Size: 10616, server xxx, user yyy, mailbox zzz, Subject: Need Web Design & Development??

The Problem is as follows
On the Mailserver (Domainfactory) this mail only exists ONCE but Kerio downloaded it twice

I have some Errors regarding POP3 connection and user storage index but they are not really indicating anything "yet"

My suspicion is the index file that manages which emails are already downloaded or not is at fault but i cant find anything about that or how the process works in kerio

any help and or guidance is greatly appriciated
any extra information i can provide i will update

Kind Regards
Jan Kubik
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