Another point of the previous article Http://www.www.lslnet.com/linux/jh/14/64635.html Mysql>; desc transport; +-----------+-----------+------+-----+---------+-------+ Null Field | Type | | | | Key | Default | Extra +-----------+-----------+------+-----+---------+-------+ Char domain | | (128) | | | | | PRI | | transport char (128) | | | | | +-----------+-----------+------+-----+---------+-------+ Mysql>; insert transport values ( 'nankai.edu.cn' and 'virtual :'); Mysql>; insert transport values ( 'freebsd.net' and 'virtual :'); Mysql>; select * from transport; +---------------+-----------+   Transport domain | | | +---------------+-----------+   Nankai.edu.cn local : | | | Freebsd.net virtual : | | | +---------------+-----------+ Why here nankai.edu.cn the local delivery agent, rather than virtual agent delivered it? Another point of the previous article He is wrong. (Just insert is virtual, it immediately select a local variable?), But I think virtual transport map does not seem much need. In addition, this section : Virtual_mailbox_limit_inbox = no Virtual_mailbox_limit_maps = mysql:/etc/postfix/mailboxsize-mysql.cf Virtual_mailbox_limit_override = yes Virtual_maildir_extended = yes Virtual_create_maildirsize = yes Postfix not vda the patch does not support, the author does not mention the patch. I really do not know how it is transferred links to the original author. Vda patch here : Http://web.onda.com.br/nadal/ Another point of the previous article --> Thank you, the answer dennis2 There is another problem that I think that using postfix mail size restrictions useful, and imap mail size restrictions on what is the use? What is the difference between concrete? ? Postfix virual mailbox can be controlled, if he can be judged quota value than virtual mail not delivered Imap how to control it? Letters coming in, he also restrict how you? I would not like to use the work of the country courie-imap Another point of the previous article I also unused quota imap. . . . Only when used in a drop in postfix. Another point of the previous article Postfix seems to be a quota patch; As imap, it seems that there really is no quota to the extent necessary and possible, after all, is only responsible way to imap "management," the letter it had received from the functional point of view should not be responsible for quota [ Closed window ]