This is a major update. Besides a lot of bugfixes it introduces some new security features. The first is the "securitylevel" configuration option. It allows you to have a finer grained handling of e-mails, that can't be encrypted.
Security levels are:
* "**may**" (default) sends e-mails any way, even unencrypted
* "**redirect**" sends unencryptable e-mails to another smtp server, and
* "**bounce**" does not deliver unencryptable e-mails, the sender get's a bounce message instead.
Second security enhancement is the storage of all passwords with a much strong hashing algorithm (bcrypt). When logging in via the admin console, the user password will be automatically changed to the stronger hash.