How can i block a person to avoid getting offline messages and e-mails?

With your e-mail you simple add that person to your SPAM or blocked list and their emails will no longer go to your inbox (Did not tell us what email you use so can not be more specific). Same with you IM, if you look in the options or settings, there is usually a place where you can remove them from your "buddy list" and/or block messages from them. (Again as you did not say which IM, can not be more specific.)

First, put them on your ignore list on Yahoo IM, and then mark the e-mails as spam.

if you go into your mail options, there is a way in there to block unwanted email, and on your messenger go into preferences and then into privacy and block it from there

when you sign into your yahoo mail, go to options at the very top right hand corner, and then select, block addresses. Umm, as for yahoo messenger, you go to settings, and find block buddy. It's super easy. Good luck!

If you're using Yahoo mail then you just need to go into your mailbox and click on "options " and then "block addresses". This will work for email and I'm sure there's some way that you can do it in messanger too.

just delete him from ur msn ....... if u cant just change a new e-mail address then can already haha