In the Automation section, verify that the Mail app is not listed twice under FlexiBee. If it is, opening the Mail app will not open a new email message window. If FlexiBee is not listed here at all, try reinstalling the app first.
Where to find Automation:
macOS Ventura (13) and later: System Settings → Privacy & Security → Automation
macOS Monterey (12) and earlier: System Preferences → Security & Privacy → Privacy tab → Automation
Note: the screenshot is from macOS 12 (Monterey) — the window looks slightly different on newer versions of macOS, but the logic is the same.
Resolution steps
First, quit the Flexi app.
Open the Terminal app and enter the following command:
tccutil reset All eu.flexibee.client
(You can find Terminal in Applications under the Utilities folder, or launch it via Spotlight — press Command + Space, type "Terminal" in the search field, and press Enter.)
This command clears the Automation section for Flexi — the Mail app is then associated with FlexiBee only once.
If the first command does not work (returns an error or does not remove the entry), try a targeted reset of AppleEvents permissions for Flexi only:
tccutil reset AppleEvents eu.flexibee.client
Only as a last resort, proceed with a more drastic action — clearing the entire Automation section for all applications:
tccutil reset AppleEvents
⚠️ WARNING: this command will remove Automation permissions for all applications on your computer, not just Flexi — you will need to grant them again afterwards.
Then restart your computer.
After launching Flexi and sending an email from the app, a prompt should appear asking whether you want to allow FlexiBee to access the Mail app. Grant access, and sending emails from Mail should then work without any issues.
If the access prompt does not appear in Flexi, download and reinstall Flexi.