tidying

[exim.git] / src / src / verify.c

diff --git a/src/src/verify.c b/src/src/verify.c
index 0ca09613078b9b1a6d0705e03ae9011bc56c11e2..125df8d91854b90f790815f9f140927ed6616aeb 100644 (file)
--- a/src/src/verify.c
+++ b/src/src/verify.c
@@ -1056,6 +1056,8 @@ no_conn:
         HDEBUG(D_acl|D_v) debug_printf("Cutthrough cancelled by presence of transport filter\n");
         }
 #ifndef DISABLE_DKIM
+      /* DKIM signing needs to add a header after seeing the whole body, so we cannot just copy
+      body bytes to the outbound as they are received, which is the intent of cutthrough. */
       if (ob->dkim.dkim_domain)
         {
         cutthrough.delivery= FALSE;