@robert Ok, My Akismet Anti-Spam is created by Automattic. not by Clean Talk.

@jesus I am using the Akismet Anti-Spam. But nothing change. Am I missing anything?  Akismet-Anti-Spam.png

@dimalifragis I have installed the QuickEmailVerification plugin，and captcha for the bot. But I can not stop them, seems they are not a bot, real peop...

@dimalifragis I do not want to close the registration page as I need the real users to register for my forum, instead of the ad account.

Attached picture 4. These accounts will post some ad or their website link in their own Profile,  44444.png

Attached picture 3  3333333.png

Attached picture 2. These accounts all have a long name. 222222222.png

@robert I think you should ask this question to Ultimate members plugin support. These avatars come from UM plugin. So UM plugin affects forum us...

@robert Thank you, I just gave a 5-star review on the plugin page. Dashboard > Forums > Dashboard and click the [Delete all cache] button. ...

@robert Thanks so much for your reply! I seem to understand some of the logic. But when I took over this forum two months ago, I did not see anything...