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Outlook is sending duplicated mails

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Growwing
Frequent Visitor

Hello dear Microsoft Community 

I've got following problem:

With one of our clients there is an issue with Outlook/Mailing 
The mailbox is IMAP
If he sends Mails to someone they'll recieve the sent message, for like 20 times.
the only suspicous thing is, that we can see 3 duplicates of that mail in the 'sent' folder.
but regardless it was recieved alot more than 3 times, either way.

Do you have an idea ?
I already 
updatet Microsoft Windows & Microsoft Office 365
made a new profile 
checked for Add-Ins or antivirus applications
I also looked it up on our firewall
we also checked the log on the mailserver

greetings
and im looking forward to recieve some help from YOU 

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