- add mini-qmail as Message delivery agent [SME: 12737]
few other fixes
TODO migrate old qmail properties and change in template
TODO catch all non existing recipient / check BCC working
- listen only via sockets
- use both unix user and virtual users
- groups and pseudonyms implemented in virtual maps
- support smarthost with and without auth
- support global and per domain delegated mail server
- support ssl
- uses qmail - recipient delimiter in left part of email.
- all domains set as local domains in mydestination
- message_size_limit
- local and remote concurency limit
