[Users] What happens ...

[Brian Morrison]

On Wed, 18 Jan 2012 00:53:08 +0100
Michael <codejodler at gmx.ch> wrote:

>  ... when i compose a mail to a group of friends, with one address 
> being invalid, and i get the error message. Is the mail already out to
> the others, and only not to the invalid recipient ? Or was it stalled
> altogether ?

A properly configured MTA should send the mail to all recipients and
only report failure to the failing address, so it knows the
Envelope-To: address for each recipient and keeps that separate from the
list of addressees on the To: address.

I would hope that most ISPs would have properly configured MTAs, but if
you run your own it would be up to you to configure it correctly.

-- 

Brian Morrison

                "I am not young enough to know everything"
                                                          Oscar Wilde