I'm not sure if this is the correct forum for this query - apologies if it isn't. I got two email addresses from a dentist I went to in Krakow and I've tried to post to both of them but have had my posts returned "failed delivery". They are [email protected] and [email protected] ( the same person's). Is there anyone out there who knows why I haven't successfully emailed them? I asked him to send an email to mine so that, in replying to him, I would have his email address - if it was in anyway different - to what he gave me but I haven't heard from him yet.