What would you do?

I've belonged to an off-road club for damn near 25 years. Recently one our members, soon to be ex-wife, sent an email to the club regarding some potential wrong doings.
To me, it seems like a defamation of character, since there have been no charges brought against this person. I've known this guy for 25 years and I find the accusations hard to believe. Granted I never lived with this person, so I don't really know much about his private life. Should I respond to her accusations or just ignore them until further information comes forward?