spf-discuss
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Re: Handling forward?

2004-01-27 03:19:20
begin  Tuesday 27 January 2004 11:11, Christopher Chan quote:
What is wrong with replacing the original sender env with the original
recipient in forwarded mail?

What's wrong: Loss of bounce messages.

If there is a problem delivering mail, bounces should go back to
sender (envelope from). If the forwarder replaces the sender with the
original recipient, bounces (that happen on the way from forwarder to
final destination) will go back to this original recipient.

On receipt of such a message the forwarder would again try to forward
the message to the final destination ==> instant mail loop.

Ok, eventually, the message will be dropped, or land in a postmaster's
mailbox, but this still has drawbacks:

 Dropped: original sender is unaware that there was a problem

 Delivered to postmaster: the postmaster needs to manually find out
 the original sender or receiver, and notify them. Cumbersome,
 especially if you run a forwarding service that serves thousands of
 accounts...

Alain

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