.cindex "exim_msgdate"
Every message handled by Exim is given a &'message id'& which is sixteen
characters long. It is divided into three parts, separated by hyphens, for
-example &`16VDhn-0001bo-D3`&. Each part is a sequence of letters and digits,
+example &`16VDhn-000000001bo-D342`&. Each part is a sequence of letters and digits,
normally encoding numbers in base 62. However, in the Darwin operating
system (Mac OS X) and when Exim is compiled to run under Cygwin, base 36
(avoiding the use of lower case letters) is used instead, because the message
contains the number of seconds since the start of the epoch (the normal Unix
way of representing the date and time of day).
.next
-After the first hyphen, the next six characters are the id of the process that
-received the message.
+After the first hyphen, the next
+.new
+eleven
+.wen
+characters are the id of the process that received the message.
.next
-There are two different possibilities for the final two characters:
+.new
+There are two different possibilities for the final four characters:
.olist
.oindex "&%localhost_number%&"
If &%localhost_number%& is not set, this value is the fractional part of the
-time of reception, normally in units of 1/2000 of a second, but for systems
+time of reception, normally in units of
+microseconds.
+but for systems
that must use base 36 instead of base 62 (because of case-insensitive file
-systems), the units are 1/1000 of a second.
+systems), the units are
+2 us.
.next
-If &%localhost_number%& is set, it is multiplied by 200 (100) and added to
-the fractional part of the time, which in this case is in units of 1/200
-(1/100) of a second.
+If &%localhost_number%& is set, it is multiplied by
+500000 (250000) and added to
+the fractional part of the time, which in this case is in units of 2 us (4 us).
.endlist
+.wen
.endlist
After a message has been received, Exim waits for the clock to tick at the
The &'query-style'& type accepts a generalized database query. No particular
key value is assumed by Exim for query-style lookups. You can use whichever
Exim variables you need to construct the database query.
+
+For the string-expansion kind of lookups, the query is given in the first
+bracketed argument of the &${lookup ...}$& expansion.
+For the list-argument kind of lookup the quury is given by the remainder of the
+list item after the first semicolon.
+
.cindex "tainted data" "quoting for lookups"
If tainted data is used in the query then it should be quuted by
using the &*${quote_*&<&'lookup-type'&>&*:*&<&'string'&>&*}*& expansion operator
single connection is being processed. When a child process terminates, the
daemon decrements its copy of the variable.
+.vitem &$smtp_notquit_reason$&
+.vindex "&$smtp_notquit_reason$&"
+When the not-QUIT ACL is running, this variable is set to a string
+that indicates the reason for the termination of the SMTP connection.
+
.vitem "&$sn0$& &-- &$sn9$&"
These variables are copies of the values of the &$n0$& &-- &$n9$& accumulators
that were current at the end of the system filter file. This allows a system
.option freeze_tell main "string list, comma separated" unset
.cindex "freezing messages" "sending a message when freezing"
+.cindex "frozen messages" "sending a message when freezing"
On encountering certain errors, or when configured to do so in a system filter,
ACL, or special router, Exim freezes a message. This means that no further
delivery attempts take place until an administrator thaws the message, or the
git://git.exim.org / exim.git / blobdiff