>  > It may not have been entirely the ISP's fault.
>
>Great post! Thank you. In this particular case, however, the email address
>in question was only used to identify the main email address at the ISP. It
>was never put into circulation anyplace else, hence the suspicion that they
>were selling it.
>Stephen

It's also possible that they were hit by address harvesting robots. 
It's getting rather common, unfortunately.

What they do is attempt to send mail to a series of common email 
names one after another:  aaron, aardvark, abner, alice... ...zebra. 
It's pretty obvious what's happening when you look at the server 
logs.  When they get a connection and are able to deliver, they log 
that name and add it to their "79 billion verified email 
addresses!!!!" CD and sell it to spammers.

It's a tough hack to fight.  The server I have been using for a 
number of years (SIMS - on Mac OS of course - by stalker.com) tracks 
these rejections and if there are too many in a certain period of 
time the sending server gets put on a temporary blacklist and all 
further attempts are blocked for a period of time.  Many mail servers 
don't have that capability.

One other little trick that some of us mail server administrators 
have been using is to feed them spamtrap addresses.  Then when any 
mail comes in containing one of those addresses, the entire mail gets 
quietly disposed of.   Since spammers often send to multiple 
addresses at a time, the real names and the spamtrap names on the 
server are often in the same mail header, and out it goes.
-- 
Bill Christensen
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