QMAIL+MH design Scheme (1)

To design users who want to use these combinations for their email, I've summed up some of the installation experience to help them. I just got some new information about Linux management, so I decided to update this issue mini-howto.

1. What is QMail? How do we use it correctly? Some explanations are given below.

QMail is a safe, reliable, efficient and concise agent for information transmission. It is now a complete replacement for a system that is sent on a typical Internet host on Unix as a platform.

Security: Security is not just a goal, it is undoubtedly a need. Users have a high demand for sending messages; it cannot make a mistake, so it must be absolutely safe and reliable. (That's why I started using qmail: I'm very upset about the many security vulnerabilities of other mail-sending systems.) ）

Reliable: QMail adopts "Straight-paper-path" design "philosophy" to ensure that once the information is received by the system, it will never be lost. QMail also supports Maildir features, a new, hyper-stable user mailbox format. Maildirs, unlike mbox files and MH folders when receiving messages, a system error can cause a receive outage. Better yet, users can not only safely read his Messages on NFS (the Network file system), but at the same time any other NFS client can send him mail.

High efficiency: On a Bsd/os Pentium machine, qmial can easily support 200000 of local information to handle the sending and receiving of information in the mailbox separately every day! Although remote delivery of DNS (domain name servers) and SMTP is inherently slow, qmail can send 20 of messages at the same time by default, so it quickly passes through mailing lists. (That's why I use qmail, I have to build a huge mailing list.) ）

Simplicity: QMail takes up much less space than any other Internet MTA. This is because: (1) Other MTA systems use separate parsing, anonymity, and mailing list mechanisms. Instead, QMail employs a simplified parsing mechanism that allows users to process their own mailing lists. (2) Other MTA is such a send mode: either fast + unsafe, or slow + queue. And QMail, in the queue once a new message appears, send immediately, so qmail send mode can only be: Fast + queue. (3) Other MTA systems actually contain a special inetd version that can reduce the load on the machine. The qmail design essentially reduces the load on the machine, so the QMail send system runs safely on your machine.

Instead of sendmail send mail: qmail supports anonymous, fully hidden hosts, virtual domain names, invalid clients, owner list overrides, end control, recoverable double records, strict RFC 822 address lists, circular detection of cross host mailing lists, checkpoints for each receiver, Failure of the host backup recovery, independent of the information to retry the scheduling, and so on. In short, it shows up in the modern MTA with a quick feature. QMail also includes outbox that can be transparently exposed to many users.