ssl_session_cache none

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 559c007..7b44815 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1267,6 +1267,29 @@
         return NGX_OK;
     }
 
+    if (builtin_session_cache == NGX_SSL_NONE_SCACHE) {
+
+        /*
+         * If the server explicitly says that it does not support
+         * session reuse (see SSL_SESS_CACHE_OFF above), then
+         * Outlook Express fails to upload a sent email to
+         * the Sent Items folder on the IMAP server via a separate IMAP
+         * connection in the background. Therefore we have a special
+         * mode (SSL_SESS_CACHE_SERVER|SSL_SESS_CACHE_NO_INTERNAL_STORE)
+         * where the server pretends that it supports session reuse,
+         * but it does not actually store any session.
+         */
+
+        SSL_CTX_set_session_cache_mode(ssl->ctx,
+                                       SSL_SESS_CACHE_SERVER
+                                       |SSL_SESS_CACHE_NO_AUTO_CLEAR
+                                       |SSL_SESS_CACHE_NO_INTERNAL_STORE);
+
+        SSL_CTX_sess_set_cache_size(ssl->ctx, 1);
+
+        return NGX_OK;
+    }
+
     cache_mode = SSL_SESS_CACHE_SERVER;
 
     if (shm_zone && builtin_session_cache == NGX_SSL_NO_BUILTIN_SCACHE) {

src/event/ngx_event_openssl.h

diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index b9771c1..4c3dd48 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -51,9 +51,10 @@
 } ngx_ssl_connection_t;
 
 
-#define NGX_SSL_DFLT_BUILTIN_SCACHE  -2
-#define NGX_SSL_NO_BUILTIN_SCACHE    -3
-#define NGX_SSL_NO_SCACHE            -4
+#define NGX_SSL_NO_SCACHE            -2
+#define NGX_SSL_NONE_SCACHE          -3
+#define NGX_SSL_NO_BUILTIN_SCACHE    -4
+#define NGX_SSL_DFLT_BUILTIN_SCACHE  -5
 
 
 #define NGX_SSL_MAX_SESSION_SIZE  4096

src/http/modules/ngx_http_ssl_module.c

diff --git a/src/http/modules/ngx_http_ssl_module.c b/src/http/modules/ngx_http_ssl_module.c
index 3359900..ea9ff8f 100644
--- a/src/http/modules/ngx_http_ssl_module.c
+++ b/src/http/modules/ngx_http_ssl_module.c
@@ -415,7 +415,7 @@
     }
 
     ngx_conf_merge_value(conf->builtin_session_cache,
-                         prev->builtin_session_cache, NGX_SSL_NO_SCACHE);
+                         prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
 
     if (conf->shm_zone == NULL) {
         conf->shm_zone = prev->shm_zone;
@@ -452,6 +452,11 @@
             continue;
         }
 
+        if (ngx_strcmp(value[i].data, "none") == 0) {
+            sscf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
+            continue;
+        }
+
         if (ngx_strcmp(value[i].data, "builtin") == 0) {
             sscf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
             continue;

src/mail/ngx_mail_ssl_module.c

diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index 7360539..a387e59 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -261,7 +261,7 @@
     }
 
     ngx_conf_merge_value(conf->builtin_session_cache,
-                         prev->builtin_session_cache, NGX_SSL_NO_SCACHE);
+                         prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
 
     if (conf->shm_zone == NULL) {
         conf->shm_zone = prev->shm_zone;
@@ -298,6 +298,11 @@
             continue;
         }
 
+        if (ngx_strcmp(value[i].data, "none") == 0) {
+            scf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
+            continue;
+        }
+
         if (ngx_strcmp(value[i].data, "builtin") == 0) {
             scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
             continue;