My client get this e-mail from you even though the domains are not registered with you but with another SSL provider. My firs though was that it was just a spam message but found it a bit strange that a company like you would send a spam message so I wanted to ask you.
Your certificate (or certificates) for the names listed below will expire in
1 days (on 02 Apr 18 14:08 +0000). Please make sure to renew
your certificate before then, or visitors to your website will encounter errors.
My domain is: