Developers of Sympa

["Paul Haldane" <address@concealed>]

> What types of loops is this trying to prevent?  There are lots of  
> valid messages which may come from address@concealed that  
> list owners, and in our case list members, may wish to see, unless  
> I'm misunderstanding the purpose or potential failings which not  
> having this in-place would cause.  Is there a reason we 
> couldn't make this a per-list configuration option?
> I can understand not looping  
> based on the X-Loop header, but what good does blocking 
> anything from mailer-daemon do?

I've found (with other other MLMs - we're just starting out with sympa) that 
there are enough badly behaved mail systems out there that will send error 
messages (and out-of-office messages etc) to the wrongest possible address.  
We had a report this morning of an out-of-office system that seems to be 
sending out-of-office responses to the address given in the To: address of 
the message distributed to list members.  That's obviously a loop waiting to 
happen - only didn't happen because the list was moderated.  With our current 
MLM (Mailbase) we re-route messages from the following local parts 

    mailer-daemon@
    uucp@
    listserv@
    majordomo@
    listproc@

to the list owners.

I agree that it may well be desirable to have this configurable per-list 
given that the acceptable risk for different lists will vary.

Paul