Great Circle Associates Majordomo-Users
(August 2001)
 

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Subject: Re: Mail Loops
From: Daniel Liston <dliston @ netscape . com>
Organization: iPlanet eCommerce Solutions, A Sun|Netscape Alliance
Date: Mon, 27 Aug 2001 02:55:46 -0500
To: Phil Bangayan <bangayan @ icsl . ucla . edu>, majordomo-users @ greatcircle . com
References: <200108270419.f7R4Juc10091@gobruins.ICSL.UCLA.EDU>

I don't normally reply to private email regarding majordomo, but
since I may not have this address much longer anyway, I will make
an exception.

The key is to find a unique identifier in the messages causing or
involved in the loop, and filter it.  The O'Reilly book, Mastering
Regular Expressions is a great help for this.

I also make use of the listname.config file to add a header field
to each message sent out, then turn around and filter on this
header.  Example:

message_headers     <<  END
X-Mailing-List: listname
END

taboo_headers       <<  END
/X-Mailing-List: listname/
END

Dan Liston

Phil Bangayan wrote:
> 
> Dan,
> 
> I'm reading a message you posted to majordomo-users
> back on July 17, 2001.  In it you say:
> 
> > I use a couple tricks to prevent loops, but specifically to
> > prevent auto-reply loops, I do this in the majordomo.cf file;
> 
> I'm curious what you put in the taboo body or taboo header
> to prevent mail loops.  My list (gobruins -- a UCLA sports
> mailing list) got hit by a mail loop today.  From reading
> the headers, I'm not exactly sure what caused it, but
> my _guess_ is the offending subscriber had the list in
> his .forward file.
> 
> Anyway, if you have any suggestions, I'd certainly
> appreciate them.
> 
> Thank you.
> 
> -Phil


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