From a7846940c876fd2a76b89240aa83e7083ae9650a Mon Sep 17 00:00:00 2001
From: Jeremy Harris <jgh146exb@wizmail.org>
Date: Sat, 29 Dec 2018 19:27:20 +0000
Subject: [PATCH] Use single TCP segment for SMTP, TLS and TCP closes.

---
 src/src/smtp_in.c         | 5 +++++
 src/src/transports/smtp.c | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/src/src/smtp_in.c b/src/src/smtp_in.c
index b3cc76c64..439d688fd 100644
--- a/src/src/smtp_in.c
+++ b/src/src/smtp_in.c
@@ -3823,6 +3823,11 @@ if (acl_smtp_quit)
     log_write(0, LOG_MAIN|LOG_PANIC, "ACL for QUIT returned ERROR: %s",
       *log_msgp);
   }
+
+#ifdef TCP_CORK
+(void) setsockopt(fileno(smtp_out), IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
+#endif
+
 if (*user_msgp)
   smtp_respond(US"221", 3, TRUE, *user_msgp);
 else
diff --git a/src/src/transports/smtp.c b/src/src/transports/smtp.c
index 472f7bb19..5516edfda 100644
--- a/src/src/transports/smtp.c
+++ b/src/src/transports/smtp.c
@@ -4323,6 +4323,9 @@ This change is being made on 31-Jul-98. After over a year of trouble-free
 operation, the old commented-out code was removed on 17-Sep-99. */
 
 SEND_QUIT:
+#ifdef TCP_CORK
+(void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
+#endif
 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
 
 END_OFF:
-- 
2.25.1