Setting Up Mail Server Clustering with Xsan
With Xsan, you can cluster multple mail servers that share the mail store. This provides
mission-critical redundancy and high performance and allows you to easily maintain
the pooled storage using Xsan tools and software.
Each server also has a primary SMTP spool le. If a server goes oine, another node
in the cluster takes over processing of the failed sever’s spool le. This happens
automatically, but you will see it noted in log les.
You can congure your mail server to join an existing mail cluster as a new member
of the cluster, or you can migrate a mail server’s mail store to another server that is a
member of the cluster.
If Xsan software is installed, you can also create a cluster, with the current server
becoming the cluster’s rst member.
Conguring Mail Clustering
1 In Server Admin, select a computer in the Servers list, then select Mail.
2 Click Advanced.
3 Click Clustering.
4 Click the Change button, then follow the onscreen instructions that appear.
Note: After a server has joined a cluster, changes to mail server settings, such as SMTP,
POP, IMAP, and logging, will aect all servers in the cluster.
When you remove the last member of a cluster, you must designate a server to take
over as a standard mail server.
Conguring Additional Mail Service Support for 8-Bit MIME
By default, many mail systems that use 8-bit character encoding for text (like Asian
language mail systems) convert from 8-bit MIME to 7-bit characters. This has the
unfortunate eect of garbling the mail.
To receive 8-bit character-encoded mail messages, disable the default conversion that
Postx performs. Use the postconf command-line tool to disable the setting.
To disable the default conversion:
1 Log in to your server as the administrator.
2 In Terminal, enter the following command:
sudo postconf -e disable_mime_output_conversion=yes
This disables the special processing of Content-Type headers while delivering mail.
82 Chapter 3 Mail Service Advanced Conguration
