Sometimes the subject line reads "Private," other times it's "Personal." Am I really supposed to be so naive as to believe I'm the only one getting this email?
It's not only spammers who do this. Many marketers with lists send out messages like this on a regular basis. I suppose it's not the worst thing one can do. It's not nearly as bad as "You Earned A Commission!" which, thankfully, I haven't even much lately.
More than anything else, it insults the intelligence of the recipient. A truly personal email wouldn't have to say "personal."