1.) What do you mean by that? 2.) Self signed or trusted CA signed certificate? If it is self signed just enter whatever you want for the emailadress. In case of an trusted CA signed cert I guess it depends on the according CA whether they will accept or verify the junk you may enter there. But what is the approach behind your question?
ssl if i create the SSL cert with the IspConfig 3, in the cert is included the webmaster (at) example.com. Where is the template in the IspConfig 3 ? I would like to change it. I would like to remove the email field
