Hotmail issue

i tried to send an event announcement to almost all my contact with large number going to blind copy. a message indicated that it could not be send because of a format problem. however, i continued to click send four times because the email did not show up in the sent folder. however, i have determined that the email went out four times but still is not listed in sent folder. i can not delete the sent file and can not send messages because i have exceeded the limit. please help i am not computer literate. my name if {Removed PII} and email is {Removed PII}