base.m4: Be extra persistent when trying to deliver mail to the relay.

[exim-config] / base.m4

diff --git a/base.m4 b/base.m4
index e78194a5645a484e2601c0a1a042a7340d76f38c..f8b09e44c91b22943acc546daa1de3d09991b4e5 100644 (file)
--- a/base.m4
+++ b/base.m4
@@ -59,6 +59,8 @@ gecos_name = $1
 gecos_pattern = ([^,:]*)
 
 SECTION(global, incoming)m4_dnl
+rfc1413_hosts = *
+rfc1413_query_timeout = 10s
 received_header_text = Received: \
        ${if def:sender_rcvhost \
             {from $sender_rcvhost\n\t} \
@@ -86,6 +88,7 @@ received_header_text = Received: \
 SECTION(global, smtp)m4_dnl
 smtp_return_error_details = true
 accept_8bitmime = true
+chunking_advertise_hosts =
 
 SECTION(global, env)m4_dnl
 keep_environment =
@@ -102,7 +105,7 @@ SECTION(global, bounce)m4_dnl
 delay_warning = 1h : 24h : 2d
 
 SECTION(global, tls)m4_dnl
-tls_certificate = CONF_sysconf_dir/server.certlist
+tls_certificate = CONF_certlist
 tls_privatekey = CONF_sysconf_dir/server.key
 tls_advertise_hosts = ${if exists {CONF_sysconf_dir/server.key} {*}{}}
 tls_dhparam = CONF_ca_dir/dh-param-2048.pem
@@ -122,6 +125,10 @@ SECTION(global, acl)m4_dnl
 acl_smtp_helo = helo
 SECTION(acl, misc)m4_dnl
 helo:
+       ## Don't worry if this is local submission.  MUAs won't necessarily
+       ## have a clear idea of their hostnames.  (For some reason.)
+       accept   condition = ${if !eq{$acl_c_mode}{submission}}
+
        ## Check that the caller's claimed identity is actually plausible.
        ## This seems like it's a fairly effective filter on spamminess, but
        ## it's too blunt a tool.  Rather than reject, add a warning header.
@@ -236,6 +243,7 @@ check_submission:
 
        ## Remember to apply submission controls.
        warn     set acl_c_mode = submission
+                control = no_enforce_sync
 
        ## Done.
        accept
@@ -261,17 +269,17 @@ check_relay:
        ## we're the correct place to send this mail.
 
        ## Known clients and authenticated users are OK.
-       accept    hosts = CONF_relay_clients
-       accept    authenticated = *
+       accept   hosts = CONF_relay_clients
+       accept   authenticated = *
 
        ## Known domains are OK.
-       accept    domains = +public
+       accept   domains = +public
 
        ## Finally, domains in our table are OK, unless they say they aren't.
-       accept    domains = \
-               ${if exists{CONF_sysconf_dir/domains.conf} \
+       accept   domains = \
+                ${if exists{CONF_sysconf_dir/domains.conf} \
                     {partial0-lsearch; CONF_sysconf_dir/domains.conf}}
-                 condition = DOMKV(service, {$value}{true})
+                condition = DOMKV(service, {$value}{true})
 
        ## Nope, that's not allowed.
        deny
@@ -284,6 +292,10 @@ SECTION(global, acl)m4_dnl
 acl_smtp_data = data
 SECTION(acl, data)m4_dnl
 data:
+       ## Don't accept messages with overly-long lines.
+       deny     message = line length exceeds SMTP permitted maximum: \
+                       $max_received_linelength > 998
+                condition = ${if >{$max_received_linelength}{998}}
 
 SECTION(acl, data-tail)m4_dnl
        accept
@@ -407,6 +419,11 @@ m4_define(<:APPLY_HEADER_CHANGES:>,
                <:${if def:acl_m_hdrrm{$acl_m_hdrrm:}}\
                $2:>):>)
 
+m4_define(<:SMTP_DELIVERY:>,
+       <:## Prevent sending messages with overly long lines.  The use of
+       ## `message_size_limit' here is somewhat misleading.
+       message_size_limit = ${if >{$max_received_linelength}{998}{1}{0}}:>)
+
 SECTION(transports)m4_dnl
 ## A standard transport for remote delivery.  By default, try to do TLS, and
 ## don't worry too much if it's not very secure: the alternative is sending
@@ -423,6 +440,7 @@ smtp:
 
 m4_define(<:SMTP_TRANS_DHBITS:>,
        <:driver = smtp
+       SMTP_DELIVERY
        APPLY_HEADER_CHANGES
        hosts_try_auth = *
        hosts_require_tls = DOMKV(tls-peer-ca, {*}{})
@@ -454,6 +472,7 @@ smtp_dhbits_2048:
 ## authentication.
 smtp_local:
        driver = smtp
+       SMTP_DELIVERY
        APPLY_HEADER_CHANGES
        hosts_require_tls = *
        tls_certificate = CONF_sysconf_dir/client.certlist
@@ -513,6 +532,13 @@ DIVERT(null)
 ### Retry configuration.
 
 SECTION(retry, default)m4_dnl
+## Be persistent when sending to the site relay.  It ought to work, but
+## particularly satellites such as laptops often encounter annoying temporary
+## failures due to network unavailability, and the usual gradual policy can
+## leave mail building up for no good reason.
+CONF_smarthost                         * \
+       F,4d,15m
+
 ## Default.
 *                                      * \
        F,2h,15m; G,16h,2h,1.5; F,4d,6h