Oliver Tappe has developed the open source e-mail client Beam (BEware, Another Mailer). The e-mail client has finally reached v1.0, and has an impressive list of features:

* Multiple Mail-Accounts (POP and SMTP), with support for default-acounts and automatic selection of appropriate account when replying, etc...
* Fully MIME compliant (Beam passes the MIME-Torture-Test)
* Performance adequate for large mail-folders (10000 msgs), with optional mail-caching
* POP-authentication (POP3 or APOP)
* SMTP-authentication (SmtpAfterPop, PLAIN, LOGIN)
* Many configuration options, esp. for mail-construction
* Full header-control, you can directly edit mail-headers before sending a message
* Stability
* Filter capabilities (using SIEVE - as described in RFC-3028)
* Identities, separating the user-info (name, mail-address, signature) from the network-info (server-address, login & password)
* Passive support for people-files (you can use them, but not yet create them) For Oliver Tappe the development hasn't come to an end! He has already set up a list of features that will be implemented in future versions:

* Online user-documentation
* Virtual mail-folders, as in Postmaster
* Searching through mail-folders, with possibility to save searches as virtual folders
* Support for mailing-lists, with automatic mail-threading
* Full SASL-support (secure authentication layer)
* Decent IMAP support, with seamless integration into local mail-handling
* Secure Transport (TLS, SSL), by means of using OpenSSL (thus probably only usable under BONE)
* Secure mail-contents by means of GPG (Gnu Privacy Guard) and perhaps S/MIME

Beam v1.0 can be downloaded from BeBits.