We've already got the topic with responses about WikiEN-l. This is a poll question.

Since they are personalised, I think that they are a personal e-mail.

Since it is directed to you, you can distribute it happily, unless they have some warning prohibiting you from doing it - but I don't think that they hold up in court anyway. If it is sent to you, and you are the intended recipient, you can distribute it. You can't distribute it if you happen to see it but it isn't sent to your e-mail address.