Sounds good.We now list the 255 results from SFS as being blacklisted by them. Further, we're doing some really basic email typo blocking which should help prevent then gamil.com issue (as it's almost certainly a gmail.com typo). This typo checking really isn't designed to be super flexible or robust. A future step might include some JS validity checking rather than just explicitly blocking what its likely a typo.
Weird, I couldn't find it.You have been able to re-send a user's activation email from the Admin CP by default since XF 1.5.0.