From the category archives:
Librenix has a posted small and sweet article that explains basic steps to configure and install a mail server with antivirus / antispam in minutes.
From the article:
This article illustrates a situation where you need to set up your own mail server (be it your home mail server, or a small office one). It actually shows [...]
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Postfix is free and powerful MTA. You can easily configure Postfix to block spam. You need to add
following directives to /etc/postfix/main.cf file:
=> disable_vrfy_command = yes : Disable the SMTP VRFY command. This stops some techniques used to harvest email addresses.
=> smtpd_delay_reject = yes : It allows Postfix to log recipient address information when rejecting a [...]
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Address rewriting allows changing outgoing email ID or domain name itself. This is good for hiding internal user names. For example:
SMTP user: tom-01
EMAIL ID: tom@domain.com
Server name: server01.hosting.com
However when tom-01 send an email from shell prompt or using php it looks like it was send from tom-01@server01.hosting.com
In some cases internal hosts have no valid Internet [...]
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Email filtering is an essential task. There are many methods like:
=> Bayesian spam filtering
=> SpamAssassin/DSPAM programs
=> Check open relay using RBL etc
Now ORDB.org is shutting down its operation. ORDB is quite effective and I use this list against all of email servers. Spammers still use 3rd party servers and desktop computers so that they [...]
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PHP has mail() function to send an email to users. However this mail() will not work:
=> If sendmail (or compatible binary) is not installed
=> If Apache Web server / Lighttpd running in chrooted jail
=> And your smtp server needs an authentication before sending an email
=> Or you just need to send email using PHP PEAR
In [...]
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When you cannot monitor your server for service availability, it is better to take help of automated monitor and restart utility. Last 4 days I was away from my server as I was enjoying my vacation. During this time due to load my lighttpd webserver died but it was restarted automatically within 2 minutes. I had utility configured for monitoring services on a Linux system called monit. It offers all features you ever needed for system monitoring and perform error recovery for UNIX like system.
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