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42 lines
1.8 KiB
42 lines
1.8 KiB
4 years ago
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# A domain-specific form of aliasing, allowing multiple virtual domains to be
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# hosted on one machine.
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#
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# info@foo.com foo-info
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# info@bar.com bar-info
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# joe@bar.com error:nouser 550 No such user here
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# jax@bar.com error:5.7.0:550 Address invalid
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# @baz.org jane@example.net
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#
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# then mail addressed to info@foo.com will be sent to the address foo-info,
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# mail addressed to info@bar.com will be delivered to bar-info, and mail
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# addressed to anyone at baz.org will be sent to jane@example.net, mail to
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# joe@bar.com will be rejected with the specified error message, and mail to
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# jax@bar.com will also have a RFC 1893 compliant error code 5.7.0.
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#
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# The username from the original address is passed as %1 allowing:
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#
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# @foo.org %1@example.com
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#
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# Additionally, if the local part consists of "user+detail" then "detail" is
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# passed as %2 and "+detail" is passed as %3 when a match against user+* is
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# attempted, so entries like
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#
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# old+*@foo.org new+%2@example.com
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# gen+*@foo.org %2@example.com
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# +*@foo.org %1%3@example.com
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# X++@foo.org Z%3@example.com
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# @bar.org %1%3
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#
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# Note: to preserve "+detail" for a default case (@domain) %1%3 must be used
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# as RHS. There are two wildcards after "+": "+" matches only a non-empty
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# detail, "*" matches also empty details, e.g., user+@foo.org matches#
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# +*@foo.org but not ++@foo.org. This can be used to ensure that the
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# parameters %2 and %3 are not empty.
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#
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# All the host names on the left hand side (foo.com, bar.com, and baz.org)
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# must be in class {w} or class {VirtHost}. The latter can be defined by the
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# macros VIRTUSER_DOMAIN or VIRTUSER_DOMAIN_FILE (analogously to
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# MASQUERADE_DOMAIN and MASQUERADE_DOMAIN_FILE). If VIRTUSER_DOMAIN or
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# VIRTUSER_DOMAIN_FILE is used, then the entries of class {VirtHost} are
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# added to class {R}, i.e., relaying is allowed to (and from) those domains.
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