Thanks Michael. But alas, that hasn’t fixed it. I’ve run the
tccutil reset AddressBook
command in Terminal. The only thing that changed as a result was several other apps also asking permission to access contacts (which makes sense I guess). But SpamSieve has asked again three times since I did that.
It’s getting pretty wearing after a fortnight of this behaviour daily, and a side effect seems to be that SS doesn’t process emails until I give permission to access contacts, with the consequence that I find several false negatives in my inbox.