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ROUTERS:
The yield of a router is one of:
OK the address was routed and either added to one of the
addr_local or addr_remote chains, or one or more new
addresses were added to addr_new. The original may be added
to addr_succeed.
REROUTED this is used when a child address is created and added to
addr_new as a consequence of a domain widening or because
"self = reroute" was encountered. The only time it is handled
differently from OK is when verifying, to force it to
continue with the child address.
DECLINE the address was not routed; pass to next router unless
no_more is set. It is permitted for additional addresses to
have been added to addr_new (or indeed for addresses to have
been put on the other chains).
PASS the address was not routed, but might have been modified;
pass to the next router unconditionally.
DISCARD the address was discarded (:blackhole: or "seen finish")
FAIL the address was not routed; do not pass to any subsequent
routers, i.e. cause routing to fail.
DEFER retry this address later.
Both ERROR and DEFER cause the message to be kept on the queue; either may
request freezing, but nowadays we try not to request freezing from routers
because it may hold up other addresses in the message.
When routing succeeds, the following field in the address can be set:
transport points to the transport instance control block
uid, gid are the uid and gid under which a local transport is to be
run if the transport does not itself specify them.
initgroups is set true if initgroups() is to be called when using the
uid and gid set up by the router.
fallback_hosts fallback host list - relevant only if the router sets up
a remote transport for the address.
errors_address where to send error messages for this address.
extra_headers additional headers to be added to the message for this
address.
remove_headers the names of headers to be removed from the message for this
address
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