I have received this email:

Hello,

I sell an e-mail database of Bitcointalk forum users.

Quantity of unique e-mails: 543,690
63,000 users from parsing and
492,000 users from the dump purchased on DarkNet.

The database is not fake, you can check it by doing the following:
1. Find any e-mail on any Bitcointalk page
2. Tell me first three characters of that e-mail
3. I send you all e-mails from my database that begin with these characters

The price of the database is 1 BTC.

This database can be used to involve new investors in ICO projects and find partners for any crypto-currency business.

If you are interested, do not hesitate to contact me.

[mod note: email and name edited out]