A lot of people have questions a long those lines about probate mailings and direct mail in generaal
This is what you should do....get the newspaper in your area and read the obituaries....and...no...Im jk....NEVER do that
There is no direct science in determining when you should or should not mail. Your mail will effect people in different ways and there is no way to make everybody happy.
I recommend you mail once when you get the file from the probate court and then one letter every other month for 3 months after...
That way you do no bombard people but you also keep yourself in front of them...
Be sincere and genuine in your letters and it will go a long way...
remember life is a parade with many different changes a long the way so just get those letters out there...
it could be that third letter that gets you the deal and you make 20K on a quick flip :)
good luck!