Chris Shenton wrote:
robert <[EMAIL PROTECTED]> writes:
Have a look at qmail, It is very scalable and well supported with
various sites and mailing lists. Iv'e been using it for well over a year
now.
Most important thing, IMHO, is uptime. If you use the Maildir mailbox
format you can put it on a solid NFS server like a NetApp and front it
with any number of MTAs and IMAP servers. Maildir is NFS-safe.
If a (used) netApp is too expensive for you, the same approach still
keeps your complicated services off your most critical file server.
I used qmail-ldap (qmail with LDAP for virtualization) and a handfull
of 1U SMTP/IMAP/POP/Squirrelmail servers. Each server had a local
read-only replica of the LDAP data sync'd from the LDAP master. Zero
downtime in well over a year, even with taking individual boxes down
(one at a time) for upgrades and such.
You could also look at Vpopmail virtualization for qmail. I've not
tried to scale that across multiple boxes so I don't know how you'd
replicate the account info.
Vpopmail can use a SQL store for account info. Like you we have several
1U SMTP/IMAP/POP/Squirrelmail toasters running with all mail stored on a
common NFS server. Which also is home to SQL for vpopmail, and for
spamd. I have the NFS server (mail store is Raid5) on a second 1 gb
network. Maildir delivery and SQL lookups are very very fast, even under
a heavy load.
2+ years with the only issue being disk failure on the OS mirror of the
toasters. I can recommend it.
DAve
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