Read Me

- tables (see: table_structure.txt)

	- limits are not defined regarding to rfc2822(?)
	define limits and apply table field sizes

	- main table stores whole mail in blob type. this wastes spaces but looks easy to
	migrate with pop3 servers.

- indexer:

	- should use gmime to parse 
	(don't index attachments which is binary/octet, just text(plain/html))
	- don't index words defined in stopwords table
	- lower words before indexing (think something for case sensitive search)