In my sixteen or seventeen years of regular participation in these forums, starting about 1994/5, I've never encountered anyone as resolutely determined not to benefit from the help he has asked for as you are, macfrombrampton.
ClamXav, like many other troubleshooting and diagnostic tools, uses heuristics — experience-based "rules of thumb" — to flag some potential threats to your security. One of those rules of thumb is "flag any email message containing a link to a web site that pretends to be somewhere it's not," because experience indicates that an intentionally misleading site is often designed to fool visitors into supplying personal information about themselves that can then be criminally misused. A great many such email messages are filtered out as SPAM by most ISPs or by the user's own email client software, but there are so many of them sent that a few get through to you, and those few messages are what ClamXav is flagging. The messages themselves are harnless — they have no payload that installs itself or performs any action on your computer. The only way any harm can come to you from them is if you 1) click the links they contain, and 2) supply the information you are asked for by the sites those links take you to.
In other words, those email messages are merely SPAM inviting you to put your security in jeopardy. If you're disinclined to do that, all you need to do is delete the email messages in the manner provided by your email client application. You don't need to use ClamXav to delete them, and as Thomas has warned you, deleting them in any manner other than the one provided by your email client is apt to corrupt the database that your email client maintains. Doing that is exactly analogous to using the Finder to delete pictures from an iPhoto Library or music from an iTunes Library — two other things one should never do, because the result will be a corrupt library database that refuses to open at all or exhibits anomalous behavior when it does open. The proper way to delete pictures from an iPhoto Library is to do it within the iPhoto application, and similarly, the proper way to delete email messages from a Mail database is to do it within Mail.