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Postfix Documentation
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My own domain name

The mydomain parameter specifies the parent domain of $ myhostname. By default, it is derived from $ myhostname by stripping off the first part (unless the result would be a top-level domain).

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

Examples (specify only one of the following):

mydomain = local.domain
mydomain = virtual.domain (virtual interface)
Postfix Documentation
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