Support /defer_ok on verify=reverse_host_lookup. Bug 344

[users/jgh/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index d78797fb77478dd4db6a2e6d334222db0e50fc78..77d966d6df2cd82aed58bb65361d73eee1506c12 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -28003,14 +28003,18 @@ is what is wanted for subsequent tests.
 .cindex "cutthrough" "requesting"
 This option requests delivery be attempted while the item is being received.
 
 .cindex "cutthrough" "requesting"
 This option requests delivery be attempted while the item is being received.
 

-The option usable in the RCPT ACL.
+The option is usable in the RCPT ACL.

 If enabled for a message recieved via smtp and routed to an smtp transport,
 If enabled for a message recieved via smtp and routed to an smtp transport,

-and the message has only one recipient,
+and only one transport, interface, destination host and port combination
+is used for all recipients of the message,

 then the delivery connection is made while the receiving connection is open
 and data is copied from one to the other.
 
 then the delivery connection is made while the receiving connection is open
 and data is copied from one to the other.
 

+An attempt to set this option for any recipient but the first
+for a mail will be quietly ignored.

 If a recipient-verify callout connection is subsequently
 If a recipient-verify callout connection is subsequently

-requested in the same ACL it is held open and used for the data,
+requested in the same ACL it is held open and used for
+any subsequent receipients and the data,

 otherwise one is made after the initial RCPT ACL completes.
 
 Note that routers are used in verify mode,
 otherwise one is made after the initial RCPT ACL completes.
 
 Note that routers are used in verify mode,


@@ -28022,12 +28026,13 @@ Headers may be modified by routers (subject to the above) and transports.
 Cutthrough delivery is not supported via transport-filters or when DKIM signing
 of outgoing messages is done, because it sends data to the ultimate destination
 before the entire message has been received from the source.
 Cutthrough delivery is not supported via transport-filters or when DKIM signing
 of outgoing messages is done, because it sends data to the ultimate destination
 before the entire message has been received from the source.

+It is not supported for messages recieved with the SMTP PRDR option in use.

 
 Should the ultimate destination system positively accept or reject the mail,
 a corresponding indication is given to the source system and nothing is queued.
 If there is a temporary error the item is queued for later delivery in the
 usual fashion. If the item is successfully delivered in cutthrough mode
 
 Should the ultimate destination system positively accept or reject the mail,
 a corresponding indication is given to the source system and nothing is queued.
 If there is a temporary error the item is queued for later delivery in the
 usual fashion. If the item is successfully delivered in cutthrough mode

-the log line is tagged with ">>" rather than "=>" and appears
+the delivery log lines are tagged with ">>" rather than "=>" and appear

 before the acceptance "<=" line.
 
 Delivery in this mode avoids the generation of a bounce mail to a
 before the acceptance "<=" line.
 
 Delivery in this mode avoids the generation of a bounce mail to a


@@ -28819,7 +28824,7 @@ verified is redirected to a single address, verification continues with the new
 address, and in that case, the subsequent value of &$address_data$& is the
 value for the child address.
 
 address, and in that case, the subsequent value of &$address_data$& is the
 value for the child address.
 

-.vitem &*verify&~=&~reverse_host_lookup*&
+.vitem &*verify&~=&~reverse_host_lookup/*&<&'options'&>

 .cindex "&%verify%& ACL condition"
 .cindex "&ACL;" "verifying host reverse lookup"
 .cindex "host" "verifying reverse lookup"
 .cindex "&%verify%& ACL condition"
 .cindex "&ACL;" "verifying host reverse lookup"
 .cindex "host" "verifying reverse lookup"


@@ -28830,6 +28835,9 @@ Verification ensures that the host name obtained from a reverse DNS lookup, or
 one of its aliases, does, when it is itself looked up in the DNS, yield the
 original IP address.
 
 one of its aliases, does, when it is itself looked up in the DNS, yield the
 original IP address.
 

+There is one possible option, &`defer_ok`&.  If this is present and a
+DNS operation returns a temporary error, the verify condition succeeds.
+

 If this condition is used for a locally generated message (that is, when there
 is no client host involved), it always succeeds.
 
 If this condition is used for a locally generated message (that is, when there
 is no client host involved), it always succeeds.