the mail server microsoft uses to send out email confirmations when mail adresses of passport users are change is blacklisted.
the server is profile.microsoft.com [188.8.131.52],
and it is listed on bl.spamcop.net
this makes it impossible to change ones mail adress in passport incase a spam filter using spamcop is inplace on the passport users side.
it really would be nice if you did something about this.
and btw: the server that is used to send out login information for webcasts [ 184.108.40.206 ] is also blacklisted at spamcop. that makes it impossible to join a webcast incase one is using spamcop