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Postfix Documentation
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My own hostname

The myhostname parameter specifies the fully-qualified domain name of the machine running the Postfix system. $ myhostname appears as the default value in many other Postfix configuration parameters.

By default, myhostname is set to the local machine name. If your local machine name is not in fully-qualified domain name form, or if you run Postfix on a virtual interface, you will have to specify the fully-qualified domain name that the mail system should use.

Alternatively, if you specify mydomain in main.cf, then Postfix will use its value to generate a fully-qualified default value for the myhostname parameter.

Examples (specify only one of the following):

/etc/postfix/main.cf:
    
myhostname = host.local.domain (machine name is not FQDN)
    
myhostname = host.virtual.domain (virtual interface)
    
myhostname = virtual.domain (virtual interface)
Postfix Documentation
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