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authorJeremy Harris <jgh146exb@wizmail.org>2015-10-08 23:59:27 +0100
committerJeremy Harris <jgh146exb@wizmail.org>2015-10-13 01:29:55 +0100
commitfa41615da7020d4d951ed3a0b98464bed66ff58b (patch)
tree5db01e6c3e1b6bafb19a319e212fd659aeea20c3
parente8ae721412364ffe473066063d9f3d0195b8b451 (diff)
max_parallel transport option
-rw-r--r--doc/doc-docbook/spec.xfpt39
-rw-r--r--doc/doc-txt/NewStuff2
-rw-r--r--src/src/deliver.c122
-rw-r--r--src/src/globals.c1
-rw-r--r--src/src/structs.h1
-rw-r--r--src/src/transport.c2
-rw-r--r--test/confs/02881
-rw-r--r--test/confs/061168
-rw-r--r--test/log/02884
-rw-r--r--test/log/061127
-rw-r--r--test/scripts/0000-Basic/028831
-rw-r--r--test/scripts/0000-Basic/061143
-rw-r--r--test/stdout/028824
-rw-r--r--test/stdout/03902
14 files changed, 347 insertions, 20 deletions
diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index ed3533a0c..f9a8efa98 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -1575,7 +1575,7 @@ If a host is unreachable for a period of time, a number of messages may be
waiting for it by the time it recovers, and sending them in a single SMTP
connection is clearly beneficial. Whenever a delivery to a remote host is
deferred,
-.cindex "hints database"
+.cindex "hints database" "deferred deliveries"
Exim makes a note in its hints database, and whenever a successful
SMTP delivery has happened, it looks to see if any other messages are waiting
for the same host. If any are found, they are sent over the same SMTP
@@ -20539,6 +20539,32 @@ transport, the &[initgroups()]& function is called when running the transport
to ensure that any additional groups associated with the uid are set up.
+.new
+.option max_parallel transports integer&!! unset
+.cindex limit "transport parallelism"
+.cindex transport "parallel processes"
+.cindex transport "concurrency limit"
+.cindex "delivery" "parallelism for transport"
+If this option is set and expands to an integer greater than zero
+it limits the number of concurrent runs of the transport.
+The control does not apply to shadow transports.
+
+.cindex "hints database" "transport concurrency control"
+Exim implements this control by means of a hints database in which a record is
+incremented whenever a transport process is beaing created. The record
+is decremented and possibly removed when the process terminates.
+Obviously there is scope for
+records to get left lying around if there is a system or program crash. To
+guard against this, Exim ignores any records that are more than six hours old.
+
+If you use this option, you should also arrange to delete the
+relevant hints database whenever your system reboots. The names of the files
+start with &_misc_& and they are kept in the &_spool/db_& directory. There
+may be one or two files, depending on the type of DBM in use. The same files
+are used for ETRN and smtp transport serialization.
+.wen
+
+
.option message_size_limit transports string&!! 0
.cindex "limit" "message size per transport"
.cindex "size" "of message, limit"
@@ -22436,6 +22462,10 @@ If two messages arrive at almost the same time, and both are routed to a pipe
delivery, the two pipe transports may be run concurrently. You must ensure that
any pipe commands you set up are robust against this happening. If the commands
write to a file, the &%exim_lock%& utility might be of use.
+.new
+Alternatively the &%max_parallel%& option could be used with a value
+of "1" to enforce serialization.
+.wen
@@ -23618,6 +23648,10 @@ start with &_misc_& and they are kept in the &_spool/db_& directory. There
may be one or two files, depending on the type of DBM in use. The same files
are used for ETRN serialization.
+.new
+See also the &%max_parallel%& generic transport option.
+.wen
+
.option size_addition smtp integer 1024
.cindex "SMTP" "SIZE"
@@ -36265,6 +36299,9 @@ Serializing ETRN runs (when &%smtp_etrn_serialize%& is set)
.next
Serializing delivery to a specific host (when &%serialize_hosts%& is set in an
&(smtp)& transport)
+.next
+Limiting the concurrency of specific transports (when &%max_parallel%& is set
+in a transport)
.endlist
diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index e7d42d43b..a7185a4e2 100644
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -15,6 +15,8 @@ Version 4.87
2. New $callout_address variable records the address used for a spam=,
malware= or verify= callout.
+ 3. Transports now take a "max_parallel" option, to limit concurrency.
+
Version 4.86
------------
diff --git a/src/src/deliver.c b/src/src/deliver.c
index a1d16eced..6a3df89bb 100644
--- a/src/src/deliver.c
+++ b/src/src/deliver.c
@@ -1945,9 +1945,6 @@ if ( !shadowing
}
}
-/*XXX prefer to do max_parallel check before we fork. Are we allowed to defer
-this late (we could be a shadow tpt)? */
-
/* Create the pipe for inter-process communication. */
if (pipe(pfd) != 0)
@@ -2317,6 +2314,22 @@ if (addr->special_action == SPECIAL_WARN && addr->transport->warn_message)
+
+/* Put the chain of addrs on the defer list. Retry will happen
+on the next queue run, earlier if triggered by a new message.
+Loop for the next set of addresses. */
+
+static void
+deferlist_chain(address_item * addr)
+{
+address_item * next;
+for (next = addr; next->next; next = next->next) ;
+next->next = addr_defer;
+addr_defer = addr;
+}
+
+
+
/*************************************************
* Do local deliveries *
*************************************************/
@@ -2348,6 +2361,7 @@ while (addr_local)
int logflags = LOG_MAIN;
int logchar = dont_deliver? '*' : '=';
transport_instance *tp;
+ uschar * serialize_key = NULL;
/* Pick the first undelivered address off the chain */
@@ -2483,7 +2497,7 @@ while (addr_local)
last = next;
batch_count++;
}
- else anchor = &(next->next); /* Skip the address */
+ else anchor = &next->next; /* Skip the address */
}
}
@@ -2614,6 +2628,40 @@ while (addr_local)
if (!addr) continue;
+ /* If the transport is limited for parallellism, enforce that here.
+ We use a hints DB entry, incremented here and decremented after
+ the transport (and any shadow transport) completes. */
+
+ if (tp->max_parallel)
+ {
+ int_eximarith_t max_parallel =
+ expand_string_integer(tp->max_parallel, TRUE);
+ if (expand_string_message)
+ {
+ logflags |= LOG_PANIC;
+ log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand max_parallel option "
+ "in %s transport (%s): %s", tp->name, addr->address,
+ expand_string_message);
+ for (addr2 = addr->next; addr; addr = addr2, addr2 = addr2->next)
+ post_process_one(addr, DEFER, logflags, DTYPE_TRANSPORT, 0);
+ continue;
+ }
+ if ( max_parallel > 0
+ && !enq_start(
+ serialize_key = string_sprintf("tpt-serialize-%s", tp->name),
+ (unsigned) max_parallel)
+ )
+ {
+ DEBUG(D_transport)
+ debug_printf("skipping tpt %s because parallelism limit %u reached\n",
+ tp->name, (unsigned) max_parallel);
+
+ deferlist_chain(addr);
+ continue;
+ }
+ }
+
+
/* So, finally, we do have some addresses that can be passed to the
transport. Before doing so, set up variables that are relevant to a
single delivery. */
@@ -2719,6 +2767,10 @@ while (addr_local)
deliver_set_expansions(NULL);
+ /* If the transport was parallelism-limited, decrement the hints DB record. */
+
+ if (serialize_key) enq_end(serialize_key);
+
/* Now we can process the results of the real transport. We must take each
address off the chain first, because post_process_one() puts it on another
chain. */
@@ -3730,7 +3782,14 @@ while (parcount > max)
"remote delivery process count got out of step");
parcount = 0;
}
- else remote_post_process(doneaddr, LOG_MAIN, NULL, fallback);
+ else
+ {
+ transport_instance * tp = doneaddr->transport;
+ if (tp->max_parallel)
+ enq_end(string_sprintf("tpt-serialize-%s", tp->name));
+
+ remote_post_process(doneaddr, LOG_MAIN, NULL, fallback);
+ }
}
}
@@ -3853,6 +3912,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
address_item *last = addr;
address_item *next;
uschar * panicmsg;
+ uschar * serialize_key = NULL;
/* Pull the first address right off the list. */
@@ -4027,6 +4087,34 @@ for (delivery_count = 0; addr_remote; delivery_count++)
return FALSE;
}
+ /* If the transport is limited for parallellism, enforce that here.
+ The hints DB entry is decremented in par_reduce(), when we reap the
+ transport process. */
+
+ if (tp->max_parallel)
+ {
+ int_eximarith_t max_parallel =
+ expand_string_integer(tp->max_parallel, TRUE);
+ if (expand_string_message)
+ {
+ panicmsg = expand_string_message;
+ goto panic_continue;
+ }
+ if ( max_parallel > 0
+ && !enq_start(
+ serialize_key = string_sprintf("tpt-serialize-%s", tp->name),
+ (unsigned) max_parallel)
+ )
+ {
+ DEBUG(D_transport)
+ debug_printf("skipping tpt %s because parallelism limit %u reached\n",
+ tp->name, (unsigned) max_parallel);
+
+ deferlist_chain(addr);
+ continue;
+ }
+ }
+
/* Set up the expansion variables for this set of addresses */
deliver_set_expansions(addr);
@@ -4055,7 +4143,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
{
panicmsg = string_sprintf("Failed to expand return path \"%s\": %s",
tp->return_path, expand_string_message);
- goto panic_continue;
+ goto enq_continue;
}
}
@@ -4066,7 +4154,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
if (!findugid(addr, tp, &uid, &gid, &use_initgroups))
{
panicmsg = NULL;
- goto panic_continue;
+ goto enq_continue;
}
/* If this transport has a setup function, call it now so that it gets
@@ -4104,11 +4192,11 @@ for (delivery_count = 0; addr_remote; delivery_count++)
if (!ok)
{
DEBUG(D_deliver) debug_printf("not suitable for continue_transport\n");
- next = addr;
+ if (serialize_key) enq_end(serialize_key);
if (addr->fallback_hosts && !fallback)
{
- for (;; next = next->next)
+ for (next = addr; ; next = next->next)
{
next->host_list = next->fallback_hosts;
DEBUG(D_deliver) debug_printf("%s queued for fallback host(s)\n", next->address);
@@ -4119,11 +4207,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
}
else
- {
- while (next->next) next = next->next;
- next->next = addr_defer;
- addr_defer = addr;
- }
+ deferlist_chain(addr);
continue;
}
@@ -4185,7 +4269,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
if (!pipe_done)
{
panicmsg = string_sprintf("unable to create pipe: %s", strerror(errno));
- goto panic_continue;
+ goto enq_continue;
}
/* Find a free slot in the pardata list. Must do this after the possible
@@ -4203,7 +4287,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
(void)close(pfd[pipe_write]);
(void)close(pfd[pipe_read]);
panicmsg = US"Unexpectedly no free subprocess slot";
- goto panic_continue;
+ goto enq_continue;
}
/* Now fork a subprocess to do the remote delivery, but before doing so,
@@ -4532,7 +4616,7 @@ for (delivery_count = 0; addr_remote; delivery_count++)
(void)close(pfd[pipe_read]);
panicmsg = string_sprintf("fork failed for remote delivery to %s: %s",
addr->domain, strerror(errno));
- goto panic_continue;
+ goto enq_continue;
}
/* Fork succeeded; increment the count, and remember relevant data for
@@ -4567,6 +4651,8 @@ for (delivery_count = 0; addr_remote; delivery_count++)
continue;
+enq_continue:
+ if (serialize_key) enq_end(serialize_key);
panic_continue:
remote_post_process(addr, LOG_MAIN|LOG_PANIC, panicmsg, fallback);
continue;
@@ -7448,7 +7534,7 @@ if (!addr_defer)
#ifdef EXPERIMENTAL_EVENT
(void) event_raise(event_action, US"msg:complete", NULL);
#endif
-}
+ }
/* If there are deferred addresses, we are keeping this message because it is
not yet completed. Lose any temporary files that were catching output from
diff --git a/src/src/globals.c b/src/src/globals.c
index 55a101ffa..20e578e27 100644
--- a/src/src/globals.c
+++ b/src/src/globals.c
@@ -1424,6 +1424,7 @@ transport_instance transport_defaults = {
NULL, /* remove_headers */
NULL, /* return_path */
NULL, /* debug_string */
+ NULL, /* max_parallel */
NULL, /* message_size_limit */
NULL, /* headers_rewrite */
NULL, /* rewrite_rules */
diff --git a/src/src/structs.h b/src/src/structs.h
index c36d08ca7..713702ea5 100644
--- a/src/src/structs.h
+++ b/src/src/structs.h
@@ -171,6 +171,7 @@ typedef struct transport_instance {
uschar *remove_headers; /* Remove these headers */
uschar *return_path; /* Overriding (rewriting) return path */
uschar *debug_string; /* Debugging output */
+ uschar *max_parallel; /* Number of concurrent instances */
uschar *message_size_limit; /* Biggest message this transport handles */
uschar *headers_rewrite; /* Rules for rewriting headers */
rewrite_rule *rewrite_rules; /* Parsed rewriting rules */
diff --git a/src/src/transport.c b/src/src/transport.c
index a6ad3ed34..c258bfd9d 100644
--- a/src/src/transport.c
+++ b/src/src/transport.c
@@ -84,6 +84,8 @@ optionlist optionlist_transports[] = {
(void *)offsetof(transport_instance, home_dir) },
{ "initgroups", opt_bool|opt_public,
(void *)offsetof(transport_instance, initgroups) },
+ { "max_parallel", opt_stringptr|opt_public,
+ (void *)offsetof(transport_instance, max_parallel) },
{ "message_size_limit", opt_stringptr|opt_public,
(void *)offsetof(transport_instance, message_size_limit) },
{ "rcpt_include_affixes", opt_bool|opt_public,
diff --git a/test/confs/0288 b/test/confs/0288
index 270ffb29e..1d41d0804 100644
--- a/test/confs/0288
+++ b/test/confs/0288
@@ -1,4 +1,5 @@
# Exim test configuration 0288
+# serialize_hosts option on smtp transport
exim_path = EXIM_PATH
host_lookup_order = bydns
diff --git a/test/confs/0611 b/test/confs/0611
new file mode 100644
index 000000000..b1bff27a1
--- /dev/null
+++ b/test/confs/0611
@@ -0,0 +1,68 @@
+# Exim test configuration 0611
+# max_parallel on transport
+
+SERVER=
+
+exim_path = EXIM_PATH
+host_lookup_order = bydns
+primary_hostname = myhost.test.ex
+spool_directory = DIR/spool
+log_file_path = DIR/spool/log/%slog
+gecos_pattern = ""
+gecos_name = CALLER_NAME
+
+# ----- Main settings -----
+
+qualify_domain = test.ex
+queue_run_in_order
+log_selector = +received_recipients
+
+acl_smtp_rcpt = accept ${if eq {SERVER}{server} {delay = 2s}}
+
+# ----- Routers -----
+
+begin routers
+
+server:
+ condition = ${if eq {SERVER}{server} {yes}{no}}
+ driver = redirect
+ data = :blackhole:
+
+rmt_client:
+ local_parts = a:b:c
+ driver = manualroute
+ route_list = * 127.0.0.1
+ self = send
+ transport = smtp
+
+lcl_client:
+ local_parts = x:y:z
+ driver = accept
+ transport = pipe
+
+# ----- Transports -----
+
+begin transports
+
+smtp:
+ driver = smtp
+ port = PORT_D
+ max_rcpt = 1
+ connection_max_messages = 1
+ max_parallel = 2
+
+pipe:
+ driver = pipe
+ command = "sleep 2; cat > /dev/null"
+ use_shell = true
+ max_parallel = 1
+
+# ----- Retry -----
+
+
+begin retry
+
+* * F,1h,10m
+
+
+# End
diff --git a/test/log/0288 b/test/log/0288
index 6e082602a..5ca2885a4 100644
--- a/test/log/0288
+++ b/test/log/0288
@@ -3,3 +3,7 @@
1999-03-02 09:44:33 10HmaX-0005vi-00 == b@test.ex R=all T=smtp defer (-53): connection limit reached for all hosts
1999-03-02 09:44:33 10HmaX-0005vi-00 => a@test.ex R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK"
1999-03-02 09:44:33 End queue run: pid=pppp
+1999-03-02 09:44:33 Start queue run: pid=pppp
+1999-03-02 09:44:33 10HmaX-0005vi-00 => b@test.ex R=all T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK"
+1999-03-02 09:44:33 10HmaX-0005vi-00 Completed
+1999-03-02 09:44:33 End queue run: pid=pppp
diff --git a/test/log/0611 b/test/log/0611
new file mode 100644
index 000000000..39c10bc12
--- /dev/null
+++ b/test/log/0611
@@ -0,0 +1,27 @@
+1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@test.ex U=CALLER P=local S=sss for a b c
+1999-03-02 09:44:33 exim x.yz daemon started: pid=pppp, no queue runs, listening for SMTP on port 1225
+1999-03-02 09:44:33 Start queue run: pid=pppp
+1999-03-02 09:44:33 10HmaY-0005vi-00 <= CALLER@test.ex H=localhost (myhost.test.ex) [127.0.0.1] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex for a@test.ex
+1999-03-02 09:44:33 10HmaY-0005vi-00 => :blackhole: <a@test.ex> R=server
+1999-03-02 09:44:33 10HmaY-0005vi-00 Completed
+1999-03-02 09:44:33 10HmaX-0005vi-00 => a@test.ex R=rmt_client T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmaY-0005vi-00"
+1999-03-02 09:44:33 10HmaZ-0005vi-00 <= CALLER@test.ex H=localhost (myhost.test.ex) [127.0.0.1] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex for b@test.ex
+1999-03-02 09:44:33 10HmaZ-0005vi-00 => :blackhole: <b@test.ex> R=server
+1999-03-02 09:44:33 10HmaZ-0005vi-00 Completed
+1999-03-02 09:44:33 10HmaX-0005vi-00 => b@test.ex R=rmt_client T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmaZ-0005vi-00"
+1999-03-02 09:44:33 End queue run: pid=pppp
+1999-03-02 09:44:33 Start queue run: pid=pppp
+1999-03-02 09:44:33 10HmbA-0005vi-00 <= CALLER@test.ex H=localhost (myhost.test.ex) [127.0.0.1] P=esmtp S=sss id=E10HmaX-0005vi-00@myhost.test.ex for c@test.ex
+1999-03-02 09:44:33 10HmbA-0005vi-00 => :blackhole: <c@test.ex> R=server
+1999-03-02 09:44:33 10HmbA-0005vi-00 Completed
+1999-03-02 09:44:33 10HmaX-0005vi-00 => c@test.ex R=rmt_client T=smtp H=127.0.0.1 [127.0.0.1] C="250 OK id=10HmbA-0005vi-00"
+1999-03-02 09:44:33 10HmaX-0005vi-00 Completed
+1999-03-02 09:44:33 End queue run: pid=pppp
+1999-03-02 09:44:33 10HmbB-0005vi-00 <= CALLER@test.ex U=CALLER P=local S=sss for y
+1999-03-02 09:44:33 10HmbC-0005vi-00 <= CALLER@test.ex U=CALLER P=local S=sss for z
+1999-03-02 09:44:33 10HmbB-0005vi-00 => y <y@test.ex> R=lcl_client T=pipe
+1999-03-02 09:44:33 10HmbB-0005vi-00 Completed
+1999-03-02 09:44:33 Start queue run: pid=pppp
+1999-03-02 09:44:33 10HmbC-0005vi-00 => z <z@test.ex> R=lcl_client T=pipe
+1999-03-02 09:44:33 10HmbC-0005vi-00 Completed
+1999-03-02 09:44:33 End queue run: pid=pppp
diff --git a/test/scripts/0000-Basic/0288 b/test/scripts/0000-Basic/0288
index 7b867cedb..ed381dad7 100644
--- a/test/scripts/0000-Basic/0288
+++ b/test/scripts/0000-Basic/0288
@@ -1,9 +1,12 @@
# serialize_hosts
need_ipv4
#
+# preload the spool
exim -odq a b
.
****
+#
+# a slow server as a test target
server PORT_S
220 ESMTP
EHLO
@@ -21,6 +24,32 @@ DATA
QUIT
250 OK
****
+#
+# First message should go; second does not wait for 1st complete
+# on same conn due to connection_max_messages, then is deferred
+# as second transport run aborted by serialize_hosts.
+exim -q
+****
+#
+# a server as a test target
+server PORT_S
+220 ESMTP
+EHLO
+250-OK
+250 HELP
+MAIL FROM:
+250 Sender OK
+RCPT TO:
+250 Recipient OK
+DATA
+354 Send data
+.
+250 OK
+QUIT
+250 OK
+****
+#
+# Remaining message on queue should go immediately; no delay
+# associated with retry rules
exim -q
****
-no_msglog_check
diff --git a/test/scripts/0000-Basic/0611 b/test/scripts/0000-Basic/0611
new file mode 100644
index 000000000..c35284147
--- /dev/null
+++ b/test/scripts/0000-Basic/0611
@@ -0,0 +1,43 @@
+# max_parallel on transport
+need_ipv4
+#
+# Remote transport:
+# preload the spool
+exim -odq a b c
+.
+****
+#
+# a slow server as a test target
+exim -DSERVER=server -bd -oX PORT_D
+****
+#
+# First and second messages should go, as separate conns due to
+# connection_max_messages, third is deferred
+# as third transport run denied by max_parallel
+exim -q
+****
+#
+#
+# Remaining message on queue should go immediately; no delay
+# associated with retry rules
+exim -q
+****
+killdaemon
+#
+########
+#
+#
+# Local transport:
+# Only one message should go as the transport takes a long
+# time and we set max_parallel=1 to serialize it
+exim y
+****
+exim z
+****
+#
+#
+sleep 3
+#
+# Remaining message on queue should go immediately; no delay
+# associated with retry rules
+exim -q
diff --git a/test/stdout/0288 b/test/stdout/0288
index 8f36a023d..3eab9dfe7 100644
--- a/test/stdout/0288
+++ b/test/stdout/0288
@@ -25,3 +25,27 @@ Date: Tue, 2 Mar 1999 09:44:33 +0000
QUIT
250 OK
End of script
+Listening on port 1224 ...
+Connection request from [127.0.0.1]
+220 ESMTP
+EHLO myhost.test.ex
+250-OK
+250 HELP
+MAIL FROM:<CALLER@test.ex>
+250 Sender OK
+RCPT TO:<b@test.ex>
+250 Recipient OK
+DATA
+354 Send data
+Received: from CALLER by myhost.test.ex with local (Exim x.yz)
+ (envelope-from <CALLER@test.ex>)
+ id 10HmaX-0005vi-00; Tue, 2 Mar 1999 09:44:33 +0000
+Message-Id: <E10HmaX-0005vi-00@myhost.test.ex>
+From: CALLER_NAME <CALLER@test.ex>
+Date: Tue, 2 Mar 1999 09:44:33 +0000
+
+.
+250 OK
+QUIT
+250 OK
+End of script
diff --git a/test/stdout/0390 b/test/stdout/0390
index a80e34c38..ca6f90cbd 100644
--- a/test/stdout/0390
+++ b/test/stdout/0390
@@ -52,6 +52,7 @@ headers_remove =
headers_rewrite =
home_directory =
no_initgroups
+max_parallel =
message_size_limit =
no_rcpt_include_affixes
retry_use_local_part
@@ -106,6 +107,7 @@ headers_remove =
headers_rewrite =
home_directory =
no_initgroups
+max_parallel =
message_size_limit =
no_rcpt_include_affixes
retry_use_local_part