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Postfix Documentation
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What delivery method: direct or indirect

By default, Postfix tries to deliver mail directly to the Internet. Depending on your local conditions this may not be possible or desirable. For example, your system may be turned off outside office hours, it may be behind a firewall, or it may be connected via a provider who does not allow direct mail to the Internet. In those cases you need to configure Postfix to deliver mail indirectly via a relay host.

Examples (specify only one of the following):

/etc/postfix/main.cf:
    
relayhost =                   (default: direct delivery to Internet)
    
relayhost = $
mydomain         (deliver via local mailhub)
    
relayhost = [mail.$
mydomain]  (deliver via local mailhub)
    
relayhost = [mail.isp.tld]    (deliver via provider mailhub)

The form enclosed with [] eliminates DNS MX lookups. Don't worry if you don't know what that means. Just be sure to specify the [] around the mailhub hostname that your ISP gave to you, otherwise mail may be mis-delivered.

The STANDARD_CONFIGURATION_README file has more hints and tips for firewalled and/or dial-up networks.

Postfix Documentation
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