The token in your mailing list confirmation email apparently has expired (typically they are good for around 24 hours).

Please re-sign-up via the website form (link and directions on homepage under Sign-up). You should then receive a fresh email requesting confirmation.

(It may take several minutes for the email to appear in your inbox. If it never arrives, the standard comments of checking your spam/junk folder(s) etc. apply. If all else fails, simply email "Subscribe" to <subscriptions2025@daviddurlach.com>. In all cases, you may expect a final email confirming you are properly signed up.)