How to Setup Sendmail Debian 11 Using Gmail SMTP?

Hello everyone,

I'm using Debian 11 server and configuring SMTP Gmail to send emails on my WordPress site. I followed this guide on Ubuntu 22.04 and it worked fine: https://arriveddev.com/install-sendm...re-gmail-smtp/

However, when I installed it on Debian 11, I encountered this error:
AUTH=client, relay=smtp.gmail.com., temporary failure, connection abort

I've looked into solutions from these guides:

https://www.linuxquestions.org/quest...server-802815/
https://www.linuxquestions.org/quest...815/page2.html
https://www.linuxquestions.org/quest...tp-4175524921/
But it still doesn't work on Debian 11. Has anyone encountered this and can share a solution? Thank you.