LOL ! 2m bitcoin is 0.002 bitcoin which equals 0.5 dollar. That is not 2 million bitcoins.
There is a big difference between
2m bitcoin and
2 mBTC2m = 2 million so 2m bitcoin = 2 million bitcoin
2 mBTC however = 0.002
In any case, not splitting hairs. But as suggested, ask users to post their usernames, nobody will post their email addresses.