If you are sending large sums of money (even in check form), it is always a good idea to send the item certified mail, return receipt requested.
1234, Main Street
Boston, MA 02123
05 April, 2005
<Recipient Address Goes Here>
I am pleased to announce that the probate process has finally concluded and the will of <name of deceased> is now ready for execution.
Accordingly, please find enclosed a check made payable to you in the amount of <$amount> representing the bequest left to you by <name of deceased>.
If you have any questions about this bequest, please feel free to contact me <or the probate attorney>. Thank you for your patience during this long process.
encl: <List of enclosed items goes here>