diff --git a/etc/exim4/exim4.conf b/etc/exim4/exim4.conf
index 2c1943e..6e7498c 100644
--- a/etc/exim4/exim4.conf
+++ b/etc/exim4/exim4.conf
@@ -893,7 +893,7 @@ spamcheck_router:
   condition = ${if !eq {$received_protocol}{spam-scanned}}
   condition = ${if !eq {$sender_address_domain}{$domain}}
   condition = ${if !eq{$acl_m_whitelist}{yes}}
-  condition = ${if < {$message_size}{512k}}
+  condition = ${if < {$message_size}{1024k}}
   local_part_suffix = +*
   local_part_suffix_optional = true
   local_parts = ${lookup mysql{SELECT vm_mboxes.mbox FROM vm_mboxes WHERE vm_mboxes.mbox='${quote_mysql:$local_part}' AND vm_mboxes.domain='${quote_mysql:$domain}' AND vm_mboxes.status > '0' AND vm_mboxes.filter = '2'}}
@@ -1120,7 +1120,7 @@ spamcheck:
     driver = pipe
     command = /usr/sbin/exim -oMr spam-scanned -bS
     use_bsmtp = true
-    transport_filter = /usr/bin/spamc -f -u $local_part_data@$domain_data
+    transport_filter = /usr/bin/spamc --max-size=1048576 --username=$local_part_data@$domain_data
     home_directory = "/tmp"
     current_directory = "/tmp"
     # must use a privileged user to set $received_protocol on the way back in!