$ echo -n joe.smith@aol.com | sha256sum
4d1612632ab95a0dec3d27f521d2b91cabe9e72a6b1ecdb8784e1ed6f3a93604  -
$ perl -MDigest::SHA=sha256_hex -E 'say sha256_hex(q/joe.smith@aol.com/)'
4d1612632ab95a0dec3d27f521d2b91cabe9e72a6b1ecdb8784e1ed6f3a93604