Seems a little buggy... I tried to test it twice and the recipient received both sides of the email flow.

Edit:

sender: name@domain1.com

recipient: name@domain2.com

'name' was the same for both, but different domains. Recipient recevied email titled: "test 1 wants to send you a secure message through Cycret"

After accepting, recipient received another email: "test 2 accepted, please enter your message"

Sender never received any emails to enter the message data...