[CentOS] multiple MX records
Mike Kercher
mike at CamaroSS.netThu Nov 10 14:46:39 UTC 2005
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centos-bounces at centos.org <> scribbled on Thursday, November 10, 2005 8:32 AM: > Tom wrote on Fri, 11 Nov 2005 01:19:57 +1300: > >> I have 2 servers, 1 is DNS master and the other slave for a > domain, if >> I was to add a second MX record using the master servers IP for the >> domain thats hosted on the slave would mail be held on the masters >> mail queue if the slave was down? > > Forget about the dns master/slave, mentioning that just > complicates it, mail queueing is independant of dns setup. If > you add a second MX of lower priority mail will be sent to it > if the MX of higher priority is not available. But you have > to configure the backup MX accordingly so that it actually > queues the mail and doesn't reject or try to deliver it locally. > With sendmail you have to allow relaying for that domain but > don't add it to the Local Domains list! Other mailers may > need different actions. > Be aware that lots of spam will be attracted by the backup MX! > > Kai Agreed! Backup MX's do attract more spam. I'd highly recommend installing MailScanner on BOTH MX's. http://www.mailscanner.info Mike
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