I received an email telling me they registered yesterday and was unable to post. I saw they never replied to the e-mail, I went ahead and activated the user id then sent them an email. The email address was a yahoo email address. I left out the email address but this is what I got back as an immediate reply. Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 delivery error: dd This user doesn't have a yahoo.com account This all seems strange to me.