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