If you block a person from your yahoo contacts list is it possible for you to send them a message?

You can send them an email. their return email will go to your SPAM folder. If you have set up your spam folder to hold the emails for at least one week it will give you an opportunity to open up the email if you are fortunate enough to catch it there before it deletes. If it is going into your spam folder open one and click on Not Spam. Or click on OPTIONS...MAIL OPTIONS...go to the left side of the screen and click on SPAM...once in go to blocked addresses and find it (usually in alphabetical order)click on it and then click on REMOVE... This should remove the block and allow it to start coming into your inbox. Go above and click on SAVE CHANGES... In addition...if your spam folder is EMPTY you might have it marked for immediate removal...check while in this same area and make sure you are keeping SPAM for the minimum one week so you can check to make sure good emails have not been directed there...If they have, then...as above..open it up and click on NOT SPAM...Again if you change keeping spam for one week (or whatever) go above and click on SAVE CHANGES