If you meant replace ' with ' , I just tried that: O&O'KeeffePM@some.org but it made no difference.
[I don't know where the extra O comes from in that example, but it should read: O 'Kee..., without the space after the O]
[I don't know where the extra O comes from in that example, but it should read: O 'Kee..., without the space after the O]