Lansing, Dan writes: > I am setting up a backup for my mail server and would like to keep it > synchronized with the main one. Your best bet here with a normal mail system (qmail, Postfix, etc.) is to store mail using NFS on a system that has RAID. Backups don't work well for mail, since they will always be out of date. I don't know of any network replicated file systems for free operating systems. If you need multiple front end servers (doubtful, since the disk is always the bottleneck), use a SQL database to store your user database. MySQL is good for this since it is fast and has reliable replication. vpopmail, a popular virtual domain manager for qmail, works well with MySQL. You can also setup Postfix to use MySQL for the user database. Even if you don't need multiple front end servers, storing your user database in a SQL database is nice. An alternate approach is PowerMail. It is designed to be redundant and distributed. It allows you to run storage daemons on multiple machines that are all kept in sync automatically. The user database can be stored in MySQL, which allows for MySQL replication. I like the concept, but would need to do testing before I put it into production. I was discouraged by the fact that it didn't compile "out of the box" on FreeBSD. Commercial support is available from PowerDNS, the company that wrote it. http://www.powerdns.com/products/powermail/ Another approach is to store both your user database and mail in an SQL database. The allows you to use MySQL replication to automatically replicate everything. To my knowledge, dbmail is the only open source mail server that does this. I have never tried this software, but I like the concept. http://www.dbmail.org/ -- David Phillips <david at acz.org> http://david.acz.org/ _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota http://www.mn-linux.org tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list