Hi @timbrns,
The bug is that instead of handling the error, it has a crash
Perhaps is more of an improvement
It should display a message saying, „Invalid email address, Check the email address and try again“, or something else, instead of throwing an exception
We currently have an old SW5 installation with the same provider (mitwald), and it does handle the response in a more elegant way (not perfect though )…
But in SW6, this is not self-explaining:
A 554 response is normally due to invalid address response, to spam or bad DNS
