Unsubscribe after just one hard bounce

I am creating an annual, announce-only list with over 1300 members. This is for a once-a-year community event where people have asked/signed up to be informed. Many of the email addresses were collected at the previous event one year ago (or more), and I expect many to be no longer effective.
I have set the bounce_score_threshold to 1.0. However, since this list will only be used once a year, those bounces would not be unsubscribed for 3 years!
How can I have mailman unsubscribe, not just nomail, after just one hard bounce?
(Yes, I have searched the archives.)
Thank you!

Edward Salm, PhD wrote:
Not if you set bounce_you_are_disabled_warnings to 0.
"How many Your Membership Is Disabled warnings a disabled member should get before their address is removed from the mailing list. Set to 0 to immediately remove an address from the list once their bounce score exceeds the threshold. This value must be an integer."
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

Edward Salm, PhD wrote:
Not if you set bounce_you_are_disabled_warnings to 0.
"How many Your Membership Is Disabled warnings a disabled member should get before their address is removed from the mailing list. Set to 0 to immediately remove an address from the list once their bounce score exceeds the threshold. This value must be an integer."
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
participants (2)
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Edward Salm, PhD
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Mark Sapiro