true

its really annoying :(

Thanks Naughtyboy.

I would like to know how I can prevent something like this on my own site? Any plugin or service that works well? If that works well why it is not used on Elgg org itself? Thanks.

try this
1).https://elgg.org/plugins/1641554.
2)https://elgg.org/plugins/821368

https://elgg.org/plugins/774755

you can search more plugin in spam category :) .i don't know about community which plugin they are using to prevent spam ,you better ask them :)

We're using a number of plugins/techniques, however we seem to be in the midst of a targeted attack right now.

I also got a lot of spam in my mailbox.
And since about once month, all mail are empty ! Nothing into the body of the mail ??

The empty mails are most likely caused by a outdated translation for the string "discussion:topic:notify:body". Please check the correctness of the translation here: https://www.transifex.com/elgg/elgg-core-2/discussions/

Spam will always be there, no matter how many plugins you try to use. Also, how many spam profiles do you think Facebook has? I have email validation turned on but they still seem to still register by a human.