Thanks guys for the immediate reply.. anyway based on your nice sugeestions i feel that having a mail server with different MX records would be definately better than having 2 servers with the same MX since i was confused about which setup to be used setting up 2 server with same MX or one with higher n one with lower priority thnks once again regards fabian > On Wed, Jul 16, 2008, fabian dacunha wrote: >> >>Dear ALL >> >>I have the following setup running good for quite sometime and i wd >> really >>apprecite if someone wd help or give some suggestions >> >>centos 5.1 >>sendmail >>dns server >> >>now recently our mail usage has increased considerably and moreover Mails >>have become a utmost top priority >> >>i have 2 options now >> >>1) have a backup server with lower higher MX >> >>i tested this setup n had some queries earlier n thanks to guys like >> scott >>for some prfect advise i did manage to check it out n it works beautiful >> >>2) have another server with same value of MX so it cd load balance and >>also doc says if one server is down or unavaliable the oher server would >>receive mail >> >>now my query is ... if i now configure a second mail server with same MX >>priority . > > Having multiple servers with the same MX priority works fine (I prefer to > think of this as distance as the lower ones have higher priority). > There's > no good reason to have multiple distances other than the shortest for > final > delivery and one or more with higher in case the primary is not available > for some reason. > >>a) do i have to create all the existing user accounts on my existing >> email >>server to this new server >>cause i already hav about 300+ email users already > > No, the secondary MX server(s) don't need any user accounts. Using > postfix, we do generate a virtual file for each secondary MX server > containing all the valid addresses for the domain(s) served by the primary > server, allowing the MX servers to reject invalid accounts without having > real user accounts. > > There are some good arguments for having a single MX server rather than > multiple MX servers as it prevents spammers from attempting to deliver > mail > through the higher distance MX servers which may well not have the same > anti-spam rules. At one of our regional ISP customers with about 10,000 > e- > mail accounts, we use a single MX server to accept incoming messages, > This > server runs postfix, amavisd-new, and clamav to pre-screen incoming > messages for worms (Windows is the Virus) and phishing messages, then it > forwards clean messages to a cluster of systems that do spamassassin > checking and message delivery to the user's Maildir message stores which > are NFS mounted on a central server. > > The MX server in this case rejects about 2,000,000 messages a day using a > variety of IP filters, and delivers about 250,000 messages a day. It has > a > load average less than 1.00 except during the daily maintenance and > security audits. > > It actually is the primary MX server for two distinct groups of domains, > each with a separate user base. Each machine that is home to the user's > home directories updates its own section of the postfix virtual table, > using rsync to update the MX server whenever anything changes with the > users. The MX server uses the postfix transport file to direct mail to > the > appropriate cluster servers to deliver mail. > > Bill > -- > INTERNET: bill at celestial.com Bill Campbell; Celestial Software LLC > URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way > Voice: (206) 236-1676 Mercer Island, WA 98040-0820 > Fax: (206) 232-9186 > > People from East Germany have found the West so confusing. It's so much > easier when you have only one party. -- Linus Torvalde, Linux Expo Canada > when asked about confusion over many Linux distributions. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.