Quoting Michael Hubbard (michael@offroadgeek.com):
I had set webmaster@balug.org to bounce on receipt because too much spam was being sent to this address. I changed the address to webperson@balug.org and re-enabled delivery.
Suggestion: ASAP, change the hyperlink to <a href="%20webperson@balug.org%20">webmaster</a>
The "%20" is parsed by Web browsers as a space character, which is harmless to legitimate mail programs at the beginning and/or end of an e-mail address. With reasonable luck, until the trick becomes more widespread, it'll stymie quite a lot of spammers' scripts.
Over the longer term, you have the usual menu of variously unsatisfactory choices to choose from. Many people elect some variant on the "hide from spammers" strategy, such as substituting CGI mailer forms for all mailto links -- or displaying graphical images of e-mail addresses, rather than the addresses themselves.
Personally, I find all variations on that strategy absurd: I openly declare my e-mail addresses publicly, and I decline to hide them.
So, what I do is perform the maximum possible amount of SMTP-time _rejection_ of spam e-mail, using Exim4, sa-exim, and J.C. Boggis's "Eximconfig" set of tweaked configuration files and addons: http://www.jcdigita.com/eximconfig/
Works for Me.<tm>