Abort if one recipient fails

[mschering]

Hi,

I'd like to ask for a new feature. At the moment when you send a mail to multiple address, and one of them fails it will send to all the others. Other mail clients like thunderbird and mac mail that I have tested handle it differently. If one of them fails, it won't send to anyone. Which is a bit more fool proof as then you can correct the recipients and hit send again.
Now it happens that users don't understand the error message and send the message to all recipients again.

Would it be possible to implement a config option not to send to anyone if one recipient fails?

Best regards,
Merijn