Storing mail headers in the database

I think that to make messages sortable we have to store all header information in the database. php imap sort functions don't pay attention to the encoding of the subject line and the sender. This breaks layout of the sorted messages

Folowing patch stores all message headers in the correct encoding in a cache, which lets us use native drupal paging mechanism. I use following table for that:

CREATE TABLE {pontomail_messages} (
mid int(11) NOT NULL auto_increment,
uid int(11) NOT NULL default '0',
sid int(11) NOT NULL default '0',
folder varchar(255),
muid int(11) NOT NULL default '0',
subject varchar(255),
mfrom varchar(255),
mto varchar(255),
mdate datetime,
size int(11) NOT NULL default '0',
recent tinyint(1),
flagged tinyint(1),
answered tinyint(1),
deleted tinyint(1),
seen tinyint(1),
draft tinyint(1),
PRIMARY KEY (mid))
/*!40100 DEFAULT CHARACTER SET utf8 */

After aplying this patch table pontomail_page_holder is depreciated.