TAILIEUCHUNG - Life with gmail phần 6

Giao hàng tận nơi thư của người sử dụng thường là kiểm soát bởi một hoặc nhiều hơn (phát âm dot kyoo mail) các tập tin "qmail." - Các tập tin trong thư mục nhà của người dùng với những cái tên bắt đầu với qmail. Dot-qmail người đàn ông trang mô tả việc sử dụng tập tin. Qmail. . | Life with qmail poll proto pop3 nodns user dsill with password flubgart is dave here fetchall forcecr This instructs fetchmail to connect to via POP3 log in as user dsill password flubgart retrieve all messages and deliver them to dave@localhost. The forcecr causes fetchmail to end each line with a carriage return when injecting the message on the local system via SMTP. qmail requires this. . getmail getmail is a program that retrieves mail from a POP server and delivers it to a maildir mailbox. It s actually a Python script so you may need to install the Python interpreter before you can use getmail getmail was written by Charles Cazabon who maintains a web page for it at http software getmail . . Multi-RCPT vs. Single RCPT delivery Say you re an MTA and one of your users sends a message to three people on . There are several ways you could do this. 1. You could open an SMTP connection to hostx send a copy of the message to the first user send a copy to the second user send a copy to the third user then close the connection. 2. You could start three processes each of which opens an SMTP connection to hostx sends a copy of the message to one of the users then closes the connection. 3. You could open an SMTP connection to host send a copy of the message addressed to all three users then close the connection. The first method is clearly inferior to the third. Even if the message is tiny it ll take at least as long. And if the message is large it ll take a lot longer and use more network bandwidth. So scratch that one. The second and third methods are a little more interesting. The third method only opens one connection to hostx and only sends one copy of the message. That makes for efficient use of bandwidth. The second method uses multiple connections and sends multiple copies of the message. That wastes bandwidth but due to the nature of the SMTP protocol requires fewer round-trip delays and is .

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