Thanks tobyink, but did you see the comment in my original post which said:
"I've also tried:
    'test2\%40mydomain.com_notmetoo' => 'on',
and
    'test2@mydomain.com_notmetoo' => 'on',
without success."
?

Your suggestion looks like the last one of mine above, but with 'off' instead of 'on'.  Are you suggesting that setting it to 'off' will check the checkbox?  I thought it would uncheck it.  Anyway, I've now tried your suggestion, and like my previous attempts, it also does nothing.

I'm guessing that this problem may be caused by the '%' in the element name, but changing the '%40' (hex for '@') to '@' doesn't seem to help.

In reply to Re^2: Unable to check checkbox via LWP::UserAgent by tel2
in thread Unable to check checkbox via LWP::UserAgent by tel2

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