### MailProxy Nginx can proxy IMAP, POP3, and SMTP protocols. Ngin可以代理IMAP，POP3和SMTP協議 ### 指令 ### proxy **syntax:***proxy****on | off*** **default:***off* **context:***mail, server* With this directive you can enable or disable the proxy for mail. 使用這條指令你可以開啟和關閉郵件代理 ### proxy_buffer **syntax:***proxy_buffer****size*** **default:***4K/8K* **context:***mail, server* With this directive you can set the buffer size for the proxy connection. The default value is equal to the size of a page (this can be either 4K or 8K depending on the platform). 使用這條指令你可以設置代理連接的緩存大小。默認值為頁面的大小(這個根據平臺的不同可能是4K或者8K） ### proxy_pass_error_message **syntax:***proxy_pass_error_message****on | off*** **default:***off* **context:***mail, server* With this directive you can pass authentification error messages obtained from the backend back to the client. Usually if authorization in nginx passed successfully then the backend cannot return errors back to the client. 通過這條指令你可以使得客戶端忽略從后端獲得的驗證錯誤消息.通常驗證成不會返回錯誤消息到客戶端。 But for some POP3 servers errors in response to correct password is a regular behavior. For example [CommuniGatePro](http://www.stalker.com/ "http://www.stalker.com/") notifies user about overcrowding of the mailbox (or other events) periodically issuing an error in authorization. In this case is worth indicating proxy_error_message on. 但是在POP3服務器中錯誤是用來更重密碼。例如[CommuniGatePro](http://www.stalker.com/ "http://www.stalker.com/") 通過驗證返回郵箱收件箱已滿的錯誤來通知用戶，這樣的代理錯誤信息是很有意義的。 ### proxy_timeout **syntax:***proxy_timeout****time*** **default:***24h* **context:***mail, server* With this directive you can set the timeout for the proxy connection. 使用這條指令你可以設置代理連接的超時時間。 ### xclient **syntax:***xclient****on | off*** **default:***on* **context:***mail, server* With this directive you can enable or disable the command XCLIENT with the connection to SMTP backend. This allows the backend to enforce limitations on the client based on IP/HELO/LOGIN. 使用這條指令你可以開啟或者關閉命令XCLIENT的SMTP后端連接.這個使得后端強制可以通過IP／HELO／LOGIN限定客戶端 If xclient is enabled then nginx first transfers to the backend: 如果xclient被啟用，nginx首先轉換到后端 ~~~ EHLO server_name ~~~ Then: ~~~ XCLIENT PROTO=ESMTP HELO=client_helo ADDR=client_ip LOGIN=authentificated_user NAME=[UNAVAILABLE] ~~~