A client of mine reported that he isn't getting emails sent from our domain. This is offcourse a false positive, as we are a legitimate comapny. I am also not hearing this issue from other clients (we have over 25,000)
Some investigation shows that his email signatures are from a software called ClamAV - by http://www.sanesecurity.com/fps.htm
He claims it's a wide spread service in Europe (I am not familiar with it) - should I bother register my domain over the software vendor?
Is this locally to this client only?
Where can I start and search for a possible solution?