Are internal emails encrypted as well?
Not normally. Basically messages into the internet will be encrypted and messages from the internet decrypted. This excludes the message exchange within the groupware. On the other hand CompanyCRYPT offers the ability to establish so called site-to-site encryption links. This is useful when your company includes branches at different location which are connected by internet mail. Those links can be protected by using a single key on every message that goes to a certain domain and are typically set up fully transparent for the end user (no notifications) almost like a email VPN tunnel.
