Are there any options for secure email?

SMTP has extensions that support encryption that are supported by most vendors. The receiving server must have a certificate (not the sender). So configuring an outbound mail relay to insist on encrypted connections and verify certificates usually does this.

If you want to encrypt it up to the end user, S / MIME or GPG are the two main options. S / MIME support is built into MS Outlook, Thunderbird and some others.

However, there is still a significant certificate management issue that is a big pain in the ass in most cases.