My email, my password and everyting is correct. All of my Odoo projects have the same outgoing mail server, but in this one, I don't know what is the cause of this error. Please see the link for the image:
https://snipboard.io/7p8On1.jpg
The error always says:
"Connection Test Failed! Here is what we got instead: -3 Temporary failure in name resolution"
I've already tried a lot of solutions including the Step 2 Verification and some online articles tutorial on ubuntu terminal to solve the problem but still I got an error. Please help me how to solve this?