I have used server address: smtp.gmail.com in Email setting but now Mikrotik Router not send email after stop google Less-secure option.
Google already stop this service from some days ago, Please suggest me how to solve this problem.

Use app password in gmail.
Search forum and you will find details.

Amazing.

I think this must have been the 4th or 5th time I see this very same question passing by the last 2 weeks.