I'm pretty sure its not a plugin problem.
I just ticked off "Allow Users to Email Other Members" under AdminCP->VbulletinUptions->Email Options.
I'll have to wait and see if that has any effect. Next step probably to disable Email Functions on that same page and switch to SMTP and see if that has any effect.
May also be forced, belatedly, to upgrade to current patch, however in googling around this seems to affect folks running versions well into the 4.1.x strata.
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