Secondary Mail Servers
Can't go without mail being down even for a brief time? Set up a secondary mail server! You will need to edit the MX record of your DNS entry. Be very careful! Messing this up can cause mail to get bounced or lost. Make sure you make a backup before you start making changes!
domain.com 14400 MX 10 mail.domain.com Leave this the way it is!
domain.com 14400 MX 20 mail2.domain.com Change mail2.domain.com to your secondary mail server.
and proper dns A records:
mail.domain.com 14400 A 255.255.255.255 Change IP number to your primary mail server's.
mail2.domain.com 14400 A 254.254.254.254 Change IP number to your secoundary mail server's.
For example:
mysticserver.com 14400 MX 10 mail.mysticserver.com.com
mysticserver.com 14400 MX 20 mail.backupserver.com
Last, make sure that mail.backupserver.com is set up to receive e-mail for your domain, otherwise your e-mail will bounce!
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