Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto
2021-08-07 10:58:28
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, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, (continued)
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Gene Hightower
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Dave Crocker
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Gene Hightower
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Dave Crocker
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Gene Hightower
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Dave Crocker
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Claus Assmann
- Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliveredto, Dave Crocker
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, John R Levine
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Ned Freed
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John R Levine <=
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Ned Freed
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, John R Levine
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Michael Peddemors
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Viktor Dukhovni
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Jeremy Harris
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, John Levine
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Jeremy Harris
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Viktor Dukhovni
- Re: [ietf-smtp] loop homework, not an experiment, draft-crocker-email-deliveredto, Jeremy Harris
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