On some systems, attempts to Send to > Email… results in an error along the lines of “No default mail client or the current mail client cannot fulfill the messaging request.”

This can occur if:
1) Your system isn’t configured about how to process mail links. To address this, ensure that Windows ‘Default Apps’ settings is configured to open the appropriate application for a ‘URL:mailto’ link.
2) If you use webmail, your browser isn’t configured about what URL to use for mail links.

For more details, see: https://4sysops.com/archives/set-chrome-firefox-edge-as-default-mail-client-mailto-handlers/