Issue with the email config in the version 2.4.0.beta9

Hello, I was configuring my forum with the version 2.4.0.beta9 and I am having a problem with the email settings, more specifc at the login, that does not work, when I tried the 2.3.9 version works just well, but this version (2.3.9) does not have some settings that I need to my forum.
Someone could help me to set up email in the version 2.4.0?

What settings are those?

It’s not possible to set mandatory groups of tags to a category, for example.