Import Dragonfly Mail Agent into base system

It is a small and lightweight Mail Transport Agent.
It accepts mails from locally installed Mail User Agents (MUA) and delivers the
mails either locally

Import Dragonfly Mail Agent into base system

It is a small and lightweight Mail Transport Agent.
It accepts mails from locally installed Mail User Agents (MUA) and delivers the
mails either locally or to a remote destination. Remote delivery includes
several features like TLS/SSL support, SMTP authentication and NULLCLIENT.

Make dma conditional to new WITHOUT_DMA option and make it respect WITHOUT_MAIL

Reviewed by: peter
Discussed with: emaste, bz, peter

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