An offtopic question regarding S/MIME Gateway certs where I have two different statements and I cannot tell which one is true or wrong. One consultant says that S/MIME Gateway Certs will allow a company to sign all emails from their employees per domain, kind of wildcard *@domain.com. The next one says, no this does’t work and I need for each employee a sole cert. But when asking him for what purpose S/MIME Gateway certs are used for, he resignes an answer and becomes quiet.
So maybe anybody could give me information on this topic? Can I sign emails from multiple employees from same domain e.g. john@domain.com and mary@domain.com with an S/MIME Gateway Cert or do I need to manage multiple certs on user basis? How do big companies with 1000+ employees manage this?