Q: My outgoing emails don't send, they are suddenly stuck in the outbox

Hi, nommo48.  

Thank you for visiting Apple Support Communities.  

I understand you are experiencing an issue with the outgoing server of your Gmail account on your Mac.  I would check your gmail account to see if two-step verification is enabled as this can cause issues with sending and receiving mail.  If the issue persists, take a look at the troubleshooting article below.  

If you can’t send or receive email on your Mac

-Jason H.