Virtual Users And Domains With Postfix, Courier And MySQL (Mandriva 2008.0)
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Virtual Users And Domains With Postfix, Courier And MySQL (Mandriva 2008.0)
This document describes how to install a Postfix mail server that is
based on virtual users and domains, i.e. users and domains that are in
a MySQL database. I’ll also demonstrate the installation and
configuration of Courier (Courier-POP3, Courier-IMAP), so that Courier
can authenticate against the same MySQL database Postfix uses. The resulting Postfix server is capable of SMTP-AUTH and TLS and quota (quota is not built into Postfix by default, I’ll show how to patch your Postfix appropriately). Passwords are stored in encrypted
form in the database (most documents I found were dealing with plain
text passwords which is a security risk). In addition to that, this
tutorial covers the installation of Amavisd, SpamAssassin and ClamAV so that emails will be scanned for spam and viruses.
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Verify DNS records with Dlint
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If you manage Domain Name System (DNS) records, you probably already know how seemingly minor errors can cause big problems. Leaving a semicolon off the end of a statement, forgetting the trailing period, or failing to add that right bracket can cause a DNS server to fail to load or to respond incorrectly to requests. Dlint is a utility that will check your domains for common errors, allowing you to fix them before a problem gets out of hand. Dlint uses Domain Information Groper (DiG) and a combination shell/Perl script to gather and parse DNS information. This script can help verify your configuration and save you some troubleshooting time in the future.
sudo aptitude install dlint
This will comple the installation
Using Dlint
You can run Dlint against any domain on the Internet, not just ones you administer. Since it uses DiG to gather DNS information, it can work with information gathered from any DNS server.
Dlint Examples
1) dlint nau.edu.
The above command recursively scans the DNS records in zone nau.edu for problems.
2) dlint 64.114.134.in-addr.arpa.
The above command recursively scans the DNS records associated with IP subnet 134.114.64.0 for problems. You had to already know that 134.114.0.0 was subnetted.
3)You can also specify a nonrecursive check with the –n command-line option. Dlint will automatically find the primary and secondary name servers for the supplied domain and attempt to do a zone transfer (AXFR).
example
dlint -n google.com
output looks similar to the following screen
Administration of DNS, especially in a large-scale environment, can be difficult to keep up with. Constant changes can leave holes or misconfigurations on your DNS server. Dlint will check DNS records for a domain and attempt to find possible errors, offering a quick-and-easy way to keep your DNS database viable and up to date.
Tags: dlink screenshot, dlint examples, General, install dlint ubuntu, Verify DNS records with Dlintdlink screenshot, dlint examples, General, install dlint ubuntu, Verify DNS records with Dlint
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