with msn messenger if someone blocks u ie the latter is already in ur contact list is there any means to know whether he/ she has blocked u??? :
blockcheckers r fake man... ive tested them ... by adding my e-mail address when i WAS online and it said that this e-mail address status is OFFLINE...when i WAS online... there is a was 2 check if the person has blocked AND deleted u...(i mean if u r NOT in his/her list) . .. goto tools > options > privacy > then click on view .... this shows all the ppl who have u in their list...but doesnt tell that u r blocked or not... so if the person's name or e-mail address is not there (in the list) ...means that u r not available in his/her list... (he/she has deleted u)...
