On Thursday, July 16, 2009, 1:40:34 PM, Justin Mason wrote: > One useful factor of ham is that it's not time-sensitive; a mail that > was ham in 2003 would still be ham today. So we can collect old ham > mail archives, or submissions of relatively old mail, if necessary.
This may be a false assumption. A spamvertised or spam sending domain from 2003 could have expired and been re-registered by a different organization. Same for ham. Both ham and spam should have expiration times. 1 year would probably be good, since spamvertised domains probably don't get renewed. Jeff C.
