X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/65e061b76867a9ea7aeeb535341b790b90ae6c21..5df838645bcdb135355205a115bf918c85987caf:/doc/doc-docbook/spec.xfpt diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index 7816bc26d..44a274b98 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -1667,6 +1667,9 @@ Symbolic links to the sources are installed in this directory, which is where the actual building takes place. In most cases, Exim can discover the machine architecture and operating system for itself, but the defaults can be overridden if necessary. +.cindex compiler requirements +.cindex compiler version +A C99-capable compiler will be required for the build. .section "PCRE library" "SECTpcre" @@ -12793,6 +12796,15 @@ argument, that is, the text that follows the command name, with leading white space removed. Following the introduction of &$smtp_command$&, this variable is somewhat redundant, but is retained for backwards compatibility. +.new +.vitem &$smtp_command_history$& +.cindex SMTP "command history" +.vindex "&$smtp_command_history$&" +A comma-separated list (with no whitespace) of the most-recent SMTP commands +received, in time-order left to right. Only a limited number of commands +are remembered. +.wen + .vitem &$smtp_count_at_connection_start$& .vindex "&$smtp_count_at_connection_start$&" This variable is set greater than zero only in processes spawned by the Exim @@ -19469,6 +19481,10 @@ instead of TRY_AGAIN. That is why the default action is to try a DNS lookup first. Only if that gives a definite &"no such host"& is the local function called. +&*Compatibility*&: From Exim 4.85 until fixed for 4.90, there was an +inadvertent constraint that a transport name as an option had to be the last +option specified. + If no IP address for a host can be found, what happens is controlled by the @@ -22128,10 +22144,14 @@ the obvious value which users understand most easily. The value of the option is expanded, and must then be a numerical value (decimal point allowed), optionally followed by one of the letters K, M, or G, -for kilobytes, megabytes, or gigabytes. If Exim is running on a system with +for kilobytes, megabytes, or gigabytes, optionally followed by a slash +and further option modifiers. If Exim is running on a system with large file support (Linux and FreeBSD have this), mailboxes larger than 2G can be handled. +The option modifier &%no_check%& can be used to force delivery even if the over +quota condition is met. The quota gets updated as usual. + &*Note*&: A value of zero is interpreted as &"no quota"&. The expansion happens while Exim is running as root, before it changes uid for @@ -22166,6 +22186,8 @@ can only be used if &%quota%& is also set. The value is expanded; an expansion failure causes delivery to be deferred. A value of zero is interpreted as &"no quota"&. +The option modifier &%no_check%& can be used to force delivery even if the over +quota condition is met. The quota gets updated as usual. .option quota_is_inclusive appendfile boolean true See &%quota%& above. @@ -23777,6 +23799,7 @@ of the message. Its value must not be zero. See also &%final_timeout%&. .option dkim_canon smtp string&!! unset .option dkim_strict smtp string&!! unset .option dkim_sign_headers smtp string&!! unset +.option dkim_hash smtp string&!! sha256 DKIM signing options. For details see section &<>&. @@ -36018,6 +36041,7 @@ the following table: &`SNI `& server name indication from TLS client hello &`ST `& shadow transport name &`T `& on &`<=`& lines: message subject (topic) +&`TFO `& connection took advantage of TCP Fast Open &` `& on &`=>`& &`**`& and &`==`& lines: transport name &`U `& local user or RFC 1413 identity &`X `& TLS cipher suite @@ -36099,6 +36123,7 @@ selection marked by asterisks: &` incoming_interface `& local interface on <= and => lines &` incoming_port `& remote port on <= lines &`*lost_incoming_connection `& as it says (includes timeouts) +&` millisec `& millisecond timestamps and QT,DT,D times &` outgoing_interface `& local interface on => lines &` outgoing_port `& add remote port to => lines &`*queue_run `& start and end queue runs @@ -36188,6 +36213,8 @@ process is started because &%queue_only%& is set or &%-odq%& was used. .cindex "log" "delivery duration" &%deliver_time%&: For each delivery, the amount of real time it has taken to perform the actual delivery is logged as DT=<&'time'&>, for example, &`DT=1s`&. +If millisecond logging is enabled, short times will be shown with greater +precision, eg. &`DT=0.304`&. .next .cindex "log" "message size on delivery" .cindex "size" "of message" @@ -36263,6 +36290,14 @@ important with the widening use of NAT (see RFC 2505). &%lost_incoming_connection%&: A log line is written when an incoming SMTP connection is unexpectedly dropped. .next +.new +.cindex "log" "millisecond timestamps" +.cindex millisecond logging +.cindex timstamps "millisecond, in logs" +&%millisec%&: Timestamps have a period and three decimal places of finer granularity +appended to the seconds value. +.wen +.next .cindex "log" "outgoing interface" .cindex "log" "local interface" .cindex "log" "local address and port" @@ -36301,6 +36336,8 @@ includes reception time as well as the delivery time for the current address. This means that it may be longer than the difference between the arrival and delivery log line times, because the arrival log line is not written until the message has been successfully received. +If millisecond logging is enabled, short times will be shown with greater +precision, eg. &`QT=1.578s`&. .next &%queue_time_overall%&: The amount of time the message has been in the queue on the local host is logged as QT=<&'time'&> on &"Completed"& lines, for @@ -38489,13 +38526,15 @@ while expanding the remaining signing options. .wen If it is empty after expansion, DKIM signing is not done. -.option dkim_selector smtp string&!! unset +.option dkim_selector smtp string list&!! unset This sets the key selector string. -You can use the &%$dkim_domain%& expansion variable to look up a matching selector. -The result is put in the expansion +.new +After expansion, which can use &$dkim_domain$&, this can be a list. +Each element in turn is put in the expansion variable &%$dkim_selector%& which may be used in the &%dkim_private_key%& option along with &%$dkim_domain%&. -If the option is empty after expansion, DKIM signing is not done. +If the option is empty after expansion, DKIM signing is not done for this domain. +.wen .option dkim_private_key smtp string&!! unset This sets the private key to use. @@ -38533,6 +38572,12 @@ list of header names. Headers with these names will be included in the message signature. When unspecified, the header names recommended in RFC4871 will be used. +.new +.option dkim_hash smtp string&!! sha256 +Can be set alternatively to &"sha1"& to use an alternate hash +method. Note that sha1 is now condidered insecure, and deprecated. +.wen + .section "Verifying DKIM signatures in incoming mail" "SECID514" .cindex "DKIM" "verification" @@ -38542,7 +38587,7 @@ Verification of DKIM signatures in SMTP incoming email is implemented via the syntactically(!) correct signature in the incoming message. A missing ACL definition defaults to accept. If any ACL call does not accept, the message is not accepted. -If a cutthrough delivery was in progress for the message it is +If a cutthrough delivery was in progress for the message, that is summarily dropped (having wasted the transmission effort). To evaluate the signature in the ACL a large number of expansion variables