autoresponding to Yahoo DMARC breakage

John R. Levine johnl at
Wed Apr 9 22:47:47 UTC 2014

>> This highly effective trick was in the procmail example vacation script in
>> 1991, and doubtless goes back much farther than that.  It's a little
>> dismaying to hear that there are still people writing autoresponders who
>> don't know about it.
> what is procmail?

The scriptable mail delivery agent that most Unix-ish systems use to sort 
mail at delivery time.  It's a marvel of robust programming, no updates 
since 2001 but still works great.

John Levine, johnl at, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail.

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