Cannot post - prevented by something called "Akismet"

[Z]

I've got a problem with my T29G, so I'm trying to write a post for help.

The forum's "Akismet" feature (whatever that is) is blocking my attempts to post, because it thinks my very detailed post, including configuration extracts, is spam.

In contrast, it lets a new poster called "Mariobernard61" post lots of spam messages about fake driving licenses without being challenged.

Why is my legitimate request for help being blocked, and why is "Mariobernard61"'s spam being permitted?