I had the same problem. Recreating the form from this tut https://contactform7.com/selectable-recipient-with-pipes/ in order to have a selectable recipient.
I have a correctly set [select your-recipient Name|[email protected]] and [your-recipient] in the To field (recipient). Still I’m getting – Invalid mailbox syntax is used.
Actually you can ignore this – it looks like an error, but when you click save it will work and the recipient can be chosen.
Takayuki, @takayukister it would be great if you check it – it’s misleading.
Otherwise awesome plugin!
