They were trying to discuss technical matters regarding Sailfish on Google's own email system. Way to go.
Good action by one end to block this conversation.

setting bounce/block on his company's mailbox causing my technical e-mails to be returned (The error that the other server returned was: 554 5.7.1 <fklebczyk@gmail.com>: Sender address rejected: Blocked by this recipient). That employee e-mail was shown as an official Jolla contact in the source files connected with the open source parts of Sailfish OS (Mer+Nemo) as can be checked on Github.