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For the sake of consistency between sender and recipient addresses, myorigin also specifies the domain name that is appended to an unqualified recipient address.
In /etc/postfix/you will have to set up a minimal number of configuration parameters.
The default is to use the local machine name, $myhostname, which defaults to the name of the machine.
Unless you are running a really small site, you probably want to change that into $mydomain, which defaults to the parent domain of the machine name.
Alternatively, you can specify the mynetworks list by hand, in which case Postfix ignores the mynetworks_style setting.
To specify the list of trusted networks by hand, specify network blocks in CIDR (network/mask) notation, for example: You can also specify the absolute pathname of a pattern file instead of listing the patterns in the file.