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...explains the reasoning as to why > the null sender is recommended, and if you are going to use another/real > address, only use one that will never auto-respond to *anything*: Yep, those using different <> null senders should be aware, that there envelope sender rewritings, such as BATV and SRS0, that make the address unique each time by adding hashed timestamps or something like that. Those rewritings undermine the vacation database. I hope that those implementations generate an unique address per day and not per message. :-) > http://tools.ietf.org/html/rfc3834#section-3....

Hey, I have several thousand email addresses, the vast majority of which are definitely no good, and I want to figure out which are good. So I will send out an email to all the email addresses. By making a list of the ones that bounced, and comparing that list with the full list, I can determine which are still good. This is for a non-profit association -- I am not in the spam business.