Log Message:
Add solid-pop3d-0.15: Flexible POP3 server

The Solid POP3 Server is an implementation of a Post Office Protocol
version 3 server that has flexibility as its main goal. The server is
easily configurable and has support for few features such as APOP
authentication scheme, virtual hosting, maildir and mailbox handling,
bulletins and expiration of messages. Each user can specify position and
type of his maildrop.

Contribyted by Piotr Stolc <socrtp@soclab.eu.org> in PR 16682