speed improvements:
	connection failure history (inter-process)
	even MX-preference selection by history
	connection caching (inter-transaction, inter-process)
	parallelization of getting MX and SMTP
	option q: quick start
	daemonize

operational:
	return information about issued SMTP command on error condition
	 (LMTP data response)
	changing envelope-from par recipient for errornous destination 
	 distinction (like "qmail")
	configuration of alias names for the host (refering $=w of sendmail.cf)

protocol (known bugs):
	8bitMIME management
	DSN notification...

reliability:
	checkpointing

configure:
	static link required?
