> « Note: emails are protected against 'email grabbers' and
> accesses are logged for security reasons »
> I think a better solution would be to hide our emails from
> spammers and grabbers. It seems you convert an email from
> no@spam.com to « no at mail spam dot com » but I'm sure 
some
> grabbers are clever enough to find these « so common »

No - most of them aren't able to. And there are plenty of 
emails in other websites, so it is not worth the effort for 
spammers.

> People don't have to know my mail

The email field is optional in the forum.