NACH allows organizers to send emails to chess players to promote their events. To do so, the organizer needs to -

1. Create a SendGrid API Key - See how to ...

2. Create a player filter 

3. Send email 

Organizers can also send emails to his subscribers too. A SendGrid API key is also needed. 

Please use the email feature responsibly. If you abuse this feature, players may choose to block your email.