A popular German computer magazine, c't, praised The Bat! Email Client. Here is the citation:
c't, issue 11/2010, p.127
"(...) The Bat is an excellent email client that is well worth a much closer look. The program supports all standard protocols and can even perform S/MIME- and PGP/GnuPG-encryption perfectly. The Pro version can be configured to encrypt all emails to the hard drive to protect them from unauthorised access by third parties.
The Bat! has acquired many fans for its ability to manage large email volumes quickly and easily. Messages can be pre-sorted into many different categories by detailed filter functions while the ability to create a wide variety of email templates and macros helps to dramatically speed up responses."