To do that, I open the Forum settings, then Spam protection, Banned Emails and add a new mask. The description under the mask field tells me "You can use Regular Expressions."

How to use them? What should I use for my case? Should it be something like ".+@163\.com"? If so, then why we can block individual emails using their string representation "as is", when the special regular expression meta-character "dot" isn't escaped (for instance, "aslifcskfad@163.com"), and it works?

But why do we not prefix the 2nd dot (in ".com") using the backslash? Just dot works too, but to be precise, we need to specify exactly the dot character.

Or maybe I do not know something about a special regex engine you are using inside YAF?

Will try .+?@163.com now.

What a strange syntax... Or maybe I do not understand something 😉

Be aware if you want to use banned emails/usernames you need to enable bot check in the host settings by setting the "Handling of Bots during Registration" to Block User

Is it a bug in the forum engine?? Using YAF 2.1.2

You need to use...

.*?@163\.com

Guys, PLEASE, fix this issue with banning new users by email mask as I'm very tired of these spammers...

did you try this and then restart the application?

.*?@163\.com

It's very strange that we need to restart the web app. Let me try again with restart.

You didn't even try to find this lol :P

Admin > Spam Protection > Spam Event Log

That should tell you what you need to know.

The Spam Event log is available in 2.20. But all Spam log entries are also listed in the Main Event log under Admin -> Maintenance -> Event log

My mistake, I thought that Log was implemented earlier.