As each message enters the qmail system, it
is placed in a mail queue. qmail uses a system of mail subdirectories and message states to
ensure that each message stored in the message queue is not lost. As an added feature,
qmail can use Maildir-style mailboxes. Maildir-style mailboxes separate user mail into
folders, which helps messages not get corrupted or lost in the single message mailbox.
qmail also uses multiple configuration files, one for each feature of qmail. While this
avoids the problem of one large configuration file, novice administrators often get
confused as to which feature is configured in which file.
Postfix
Postfix is the default MTA package installed on openSUSE. Wietse Venema wrote the Postfix
program to be a complete MTA package. Similar to qmail, Postfix is written as a modular
program. Postfix uses several different programs to implement the MTA functionality.
However, Postfix requires only one separate user ID to be added to the mail server. Unlike
qmail, which uses a separate user ID for each module, Postfix runs each module under
one user ID.
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