TRIVIAL-REWRITE(8) TRIVIAL-REWRITE(8)
NAME
trivial-rewrite - Postfix address rewriting and resolving daemon
SYNOPSIS
trivial-rewrite [generic Postfix daemon options]
DESCRIPTION
The trivial-rewrite daemon processes two types of client service requests: rewrite Rewrite an address to standard form. The trivial-rewrite daemon by default appends local domain information to unqualified addresses, swaps bang paths to domain form, and strips source routing information. This process is under control of several configuration parameters (see below). resolve Resolve an address to a (transport, nexthop, recipient) triple. The meaning of the results is as follows: transport The delivery agent to use. This is the first field of an entry in the master.cf file. nexthop The host to send to and optional delivery method informa- tion. recipient The envelope recipient address that is passed on to nex- thop.
DEFAULT DELIVERY METHODS
By default, Postfix uses one of the following delivery methods. This may be overruled with the optional transport(5) table. The default delivery method is selected by matching the recipient address domain against one of the following: $mydestination $inet_interfaces The transport and optional nexthop are specified with $local_transport. The default nexthop is the recipient domain. $virtual_alias_domains The recipient address is undeliverable (user unknown). By defi- nition, all known addresses in a virtual alias domain are aliased to other addresses. $virtual_mailbox_domains The transport and optional nexthop are specified with $vir- tual_transport. The default nexthop is the recipient domain. $relay_domains The transport and optional nexthop are specified with $relay_transport. This overrides the optional nexthop informa- tion that is specified with $relayhost. The default nexthop is the recipient domain. none of the above The transport and optional nexthop are specified with $default_transport. This overrides the optional nexthop infor- mation that is specified with $relayhost. The default nexthop is the recipient domain.
SERVER PROCESS MANAGEMENT
The trivial-rewrite servers run under control by the Postfix master server. Each server can handle multiple simultaneous connections. When all servers are busy while a client connects, the master creates a new server process, provided that the trivial-rewrite server process limit is not exceeded. Each trivial-rewrite server terminates after serving at least $max_use clients of after $max_idle seconds of idle time.
STANDARDS
None. The command does not interact with the outside world.
SECURITY
The trivial-rewrite daemon is not security sensitive. By default, this daemon does not talk to remote or local users. It can run at a fixed low privilege in a chrooted environment.
DIAGNOSTICS
Problems and transactions are logged to syslogd(8).
BUGS
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to this pro- gram. See the Postfix main.cf file for syntax details and for default values. Use the postfix reload command after a configuration change. Miscellaneous empty_address_recipient The recipient that is substituted for the null address. inet_interfaces The network interfaces that this mail system receives mail on. This information is used to determine if user@[net.work.addr.ess] is local or remote. Mail for local users is given to the $local_transport. mydestination List of domains that are given to the $local_transport. virtual_alias_domains List of simulated virtual domains (domains with all recipients aliased to some other local or remote domain). virtual_mailbox_domains List of domains that are given to the $virtual_transport. relay_domains List of domains that are given to the $relay_transport. resolve_unquoted_address When resolving an address, do not quote the address localpart as per RFC 822, so that additional @, % or ! characters remain visible. This is technically incorrect, but allows us to stop relay attacks when forwarding mail to a Sendmail primary MX host. relocated_maps Tables with contact information for users, hosts or domains that no longer exist. See relocated(5). Rewriting myorigin The domain that locally-posted mail appears to come from. allow_percent_hack Rewrite user%domain to user@domain. append_at_myorigin Rewrite user to user@$myorigin. append_dot_mydomain Rewrite user@host to user@host.$mydomain. swap_bangpath Rewrite site!user to user@site. Routing local_transport Where to deliver mail for destinations that match $mydestination or $inet_interfaces. The default transport is local:$myhost- name. Syntax is transport:nexthop; see transport(5) for details. The :nexthop part is optional. virtual_transport Where to deliver mail for non-local domains that match $vir- tual_mailbox_domains. The default transport is virtual. Syntax is transport:nexthop; see transport(5) for details. The :nexthop part is optional. relay_transport Where to deliver mail for non-local domains that match $relay_domains. The default transport is relay (which normally is a clone of the smtp transport). Syntax is transport:nexthop; see transport(5) for details. The :nexthop part is optional. default_transport Where to deliver all other non-local mail. The default trans- port is smtp. Syntax is transport:nexthop; see transport(5) for details. The :nexthop part is optional. parent_domain_matches_subdomains List of Postfix features that use domain.tld patterns to match sub.domain.tld (as opposed to requiring .domain.tld patterns). relayhost The default host to send non-local mail to when no host is spec- ified with $relay_transport or $default_transport, and when the recipient address does not match the optional the transport(5) table. transport_maps List of tables with recipient or domain to (transport, nexthop) mappings.
SEE ALSO
master(8) process manager syslogd(8) system logging transport(5) transport table format relocated(5) format of the "user has moved" table
LICENSE
The Secure Mailer license must be distributed with this software.
AUTHOR(S)
Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA TRIVIAL-REWRITE(8)
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