Sieve forwarding loop destroys e-mail

[Matt Garretson]

Wesley Craig wrote:
> There's no way to do that, but one could insert a header, e.g, "X- 
> Sieve-Redirect".  Maybe the value would be a random string which was  
> also saved in the duplicate DB.

And, Joseph Brennan wrote:
> We might be smarter with case [1] if lmtpd inserted a "X-Been-Here"
> type header as it hands off to the MTA, so that it could detect a
> loop the first time the message comes back.


Along similar lines, any well-written Procmail recipe which redirects 
mail typically checks for, or adds, an "X-Loop" header before 
forwarding anything.

If the "editheader" Sieve extension gets implemented, then a well-
written sieve script should be able to do the same type of thing.
To me this seems a bit more sane than expecting lmtp or sieve to 
accomplish it automatically.

-Matt