I have created a new send/receive account, but the OK/Cancel buttons are missing here too.
The multiple emails are only received.
I have tried several email addresses at T-Online and the following:
If I enter only one email address under Account and send an email to this address from another computer with a different email account, the email only appears once in Outlook.
If I enter a second email and send a message to the first email, it appears twice. If I have three emails in the account, the same email appears three times in Outlook. And I suspect it will continue like this.
However, if I enter two emails in my account from different providers, e.g. @T-ONLINE and @VODAFON, and send messages to them, they only appear once each.


Now it's your turn - and all my other computers with the same OS and Office don't have this problem.