Can something be done to stop such things.
In my opinion, evcforum should be more cautious about making email addresses available. I'd suggest that seeing email addresses should require that a member has made enough posts to graduate from "junior member" status - with a possible exception for admin email addresses. Even better would be a forum page where you type in your email message to another member, allowing email without exposing the email address.
In the meantime, it is very likely that spammer tatiana has signed up yet a third time, but at present the evidence seems a bit thin for suspending the apparent new incarnation.