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Hi Christian,
The answer you gave me did not solve the problem but it made fault visible. As is often the case, the real problem was me!
A few days ago I decided that two of us should get administrative notifications from the site so I changed the 'Admin mail address' in the general preferences, adding the other persons email and separating the two emails with a coma, as one does on a normal email. That is what caused the problem.
Once I changed the mail settings, as you suggested, instead of the inscrutable 'Could not instantiate mail function', I got an error message saying that it didn't recognise the two emails separated by a comma as a valid email address.
So, thank you. You did help me fix it in a roundabout way.
But this lead me back to the original problem I tried to solve. How do I get admin emails directed to two different people?
Any ideas?