base.m4: Neither accept nor transmit messages with long lines over SMTP.

[exim-config] / exchange.m4

diff --git a/exchange.m4 b/exchange.m4
index 9f8324a6c9f74bd862f788e308c2d76f4d70a273..cf2a81b807f4e29bdb558f3d61dcd851b9086999 100644 (file)
--- a/exchange.m4
+++ b/exchange.m4
@@ -52,16 +52,35 @@ mail_client_addr:
                           {${if match_domain {$sender_address_domain} \
                                              {+public} \
                                 {+allnets}{! +allnets}}})}
-                ADD_HEADER(<:X-CONF_header_token-Warning: \
-                       RCLNTLSNDR \
-                       Apparently local sender, but received from remote \
-                       server.\n\t\
-                       sender=$sender_address \
-                       host=$sender_host_address:>)
+                 WARNING_HEADER(RCLNTLSNDR,
+                                <:Apparently local sender, but received from remote \
+                                  server.\n\t\
+                                  sender=$sender_address \
+                                  host=$sender_host_address:>)
 
        ## OK.
        accept
 
+DIVERT(null)
+###--------------------------------------------------------------------------
+### Rename locally-meaningful headers in mail from outside.
+
+m4_define(<:DISTORTED_HEADERS:>,
+<:X-CONF_header_token-SpamAssassin-Score,
+X-CONF_header_token-SpamAssassin-Status:>)
+
+SECTION(acl, data)m4_dnl
+       ## If this message is coming from outside then rename headers which
+       ## look like the ones we're likely to add.  This is most relevant for
+       ## our spam-report headers, because I'm not sure I understand why
+       ## someone would want to fake an X-Distorted-Warning header.
+       warn    !condition = ${if eq{$acl_c_mode}{submission}}
+               !hosts = +allnets
+                set acl_m_hdradd = ${if def:acl_m_hdradd{$acl_m_hdradd}}\
+                       RENAME_HEADERS_ADD(<:DISTORTED_HEADERS:>)
+                set acl_m_hdrrm = ${if def:acl_m_hdrrm{$acl_m_hdrrm:}}\
+                       RENAME_HEADERS_REMOVE(<:DISTORTED_HEADERS:>)
+
 DIVERT(null)
 ###--------------------------------------------------------------------------
 ### The obvious trivial router.
@@ -77,6 +96,8 @@ local:
                           CONF_master_domain : \
                           *.CONF_master_domain }}
        self = fail
+       same_domain_copy_routing = yes
+       ignore_target_hosts = +bogus
        transport = smtp_local
        no_more
 
@@ -88,6 +109,8 @@ remote:
                               {false})}} \
                       {}{ ! +public }}
        self = fail
+       same_domain_copy_routing = yes
+       ignore_target_hosts = +bogus_public
        transport = smtp
        no_more