Hi all,
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? I am wanting to have mail held when the slave is down so it gets delivered immediately it comes back up instead of being held on other servers for up to 8 hours before I get it.
hope that makes sense.
tom
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
centos-bounces@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.
Mike
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Kai Schaetzl -
Mike Kercher -
Tom