Re: loop homework, not an experiment, draft-crocker-email-deliveredto

>> When mail systems do internal forwards using things like .forward or
>> /etc/alias, each forward adds a Delivered-To, which breaks a->b->c->a
>> loops.  Since there's no SMTP involved, there's usually no Received and
>> never an Envelope-To.  Also, as Sam, Viktor, and I have explained, the
>> internal forwards are not necessarily to or from anything that has an
>> externally valid envelope address.
>
> What happens when there are multiple recipients? Message splitting?

For Delivered-To loop breaking it doesn't matter since it's just a token 
to show that the message has already been wherever it is.

I believe that Exim does one delivery at a time so its Envelope-To only 
has one address.  I can ask Jeremy what happens with multiple recipient 
messages.

Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly