Ah - true - we're talking about different things though (which is my fault to start with, but I see confusion in others too).
MD5 is what's used in the linked spreadsheet's email address fields, which is what I thought we were talking about. SHA-256 is used in jedsmith's lists.
OS X users, if you are paranoid about using online tools for the SHA-256 hashing, you can do this from the command line with sha256deep.
Via Homebrew it'd go like this (replace the 1st step with whatever package manager you like):
$ brew install md5deep
$ echo -n my@email | sha256deep
d869524229c1e2f6139194fee1aac14f873b008dd0279458cbdfb6b3fbade1d2