2 - Raspberry PI Community Projects

virtual_mailbox_base = /var/mail/vhosts
Example 11.4
Directives to add in the /etc/postfix/main.cf file
Again, the syntax of the /etc/postfix/vmailbox file is quite straightforward: two fields separated
with whitespace. The first field is an email address within one of the virtual domains,
and the second field is the location of the associated mailbox (relative to the directory specified
in virtual_mailbox_base). If the mailbox name ends with a slash (/), the emails will be stored in
the maildir format; otherwise, the traditional mbox format will be used. The maildir format uses
a whole directory to store a mailbox, each individual message being stored in a separate file.
In the mbox format, on the other hand, the whole mailbox is stored in one file, and each line
starting with “From ” (From followed by a space) signals the start of a new message.
# Jean's email is stored as maildir, with
# one file per email in a dedicated directory
jean@falcot.org falcot.org/jean/
# Sophie's email is stored in a traditional "mbox" file,
# with all mails concatenated into one single file
sophie@falcot.org falcot.org/sophie
Example 11.5
The /etc/postfix/vmailbox file
11.1.3. Restrictions for Receiving and Sending
The growing number of unsolicited bulk emails (spam) requires being increasingly strict when
deciding which emails a server should accept. This section presents some of the strategies included
in Postfix.
CULTURE
The spam problem
“Spam” is a generic term used to designate all the unsolicited commercial
emails (also known as UCEs) that flood our electronic mailboxes; the unscrupulous
individuals sending them are known as spammers. They care lile
about the nuisance they cause, since sending an email costs very lile, and
only a very small percentage of recipients need to be aracted by the offers
for the spamming operation to make more money than it costs. The process
is mostly automated, and any email address made public (for instance, on a
web forum, or on the archives of a mailing list, or on a blog, and so on) will be
discovered by the spammers' robots, and subjected to a never-ending stream
of unsolicited messages.
All system administrators try to face this nuisance with spam filters, but of
course spammers keep adjusting to try to work around these filters. Some
even rent networks of machines compromised by a worm from various crime
syndicates. Recent statistics estimate that up to 95% of all emails circulating
on the Internet are spam!
Chapter 11 — Network Services: Postfix, Apache, NFS, Samba, Squid, LDAP
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