This is done easily using 1 of 2 ways...
the easier way is to have an email guesser which bombards an email login form with random character combos and waits for a DENIAL message.
If the DENIAL message says "INVALID PASSWORD" instead of "no such user" or something like that then the email address is recorded and a new string is sent.
This harvesting method's been around for a long time and some systems guard against it.
The other method is data overflow....
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