Receive an email on your Trello board
Any email sent to your board email address will be created as a new card on your Trello board. If you've configured a custom email address, and have set up forwarding rules, emails sent to that address will also be created as new cards in Trello.
Click on the Trello card to view the email you have received.
Reply to an email in Trello
To reply to an email that you've received in Trello, open the card and click ‘Reply via Email’ to open the email editor. The reply you sent will be visible as a comment on the card.
Send a new email in Trello
You can also send an email from any new or existing card in Trello by clicking the SendBoard button and choosing 'New Email'. Enter your message and the recipient details email editor window and hit 'Send'.