diff --git a/src/mail/ngx_mail.c b/src/mail/ngx_mail.c
index 73668a5..aa77364 100644
--- a/src/mail/ngx_mail.c
+++ b/src/mail/ngx_mail.c
@@ -261,6 +261,9 @@
         in_addr->addr = imls[l].addr;
         in_addr->ctx = imls[l].ctx;
         in_addr->bind = imls[l].bind;
+#if (NGX_MAIL_SSL)
+        in_addr->ssl = imls[l].ssl;
+#endif
     }
 
     /* optimize the lists of ports and addresses */
@@ -370,6 +373,10 @@
 
                 imip->addrs[i].addr_text.len = len;
                 imip->addrs[i].addr_text.data = text;
+
+#if (NGX_MAIL_SSL)
+                imip->addrs[i].ssl = in_addr[i].ssl;
+#endif
             }
 
             if (done) {
diff --git a/src/mail/ngx_mail.h b/src/mail/ngx_mail.h
index 1efff5b..03297e2 100644
--- a/src/mail/ngx_mail.h
+++ b/src/mail/ngx_mail.h
@@ -34,6 +34,9 @@
     ngx_mail_conf_ctx_t    *ctx;
 
     unsigned                bind:1;
+#if (NGX_MAIL_SSL)
+    unsigned                ssl:1;
+#endif
 } ngx_mail_listen_t;
 
 
@@ -41,6 +44,9 @@
     in_addr_t               addr;
     ngx_mail_conf_ctx_t    *ctx;
     ngx_str_t               addr_text;
+#if (NGX_MAIL_SSL)
+    ngx_uint_t              ssl;    /* unsigned   ssl:1; */
+#endif
 } ngx_mail_in_addr_t;
 
 
@@ -60,6 +66,9 @@
     in_addr_t               addr;
     ngx_mail_conf_ctx_t    *ctx;
     unsigned                bind:1;
+#if (NGX_MAIL_SSL)
+    unsigned                ssl:1;
+#endif
 } ngx_mail_conf_in_addr_t;
 
 
diff --git a/src/mail/ngx_mail_core_module.c b/src/mail/ngx_mail_core_module.c
index 07e3ab6..10e6c8b 100644
--- a/src/mail/ngx_mail_core_module.c
+++ b/src/mail/ngx_mail_core_module.c
@@ -351,18 +351,31 @@
         }
     }
 
-    if (cf->args->nelts == 2) {
-        return NGX_CONF_OK;
+    for (i = 2; i < cf->args->nelts; i++) {
+
+        if (ngx_strcmp(value[i].data, "bind") == 0) {
+            imls->bind = 1;
+            continue;
+        }
+
+        if (ngx_strcmp(value[i].data, "ssl") == 0) {
+#if (NGX_MAIL_SSL)
+            imls->ssl = 1;
+            continue;
+#else
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "the \"ssl\" parameter requires "
+                               "ngx_mail_ssl_module");
+            return NGX_CONF_ERROR;
+#endif
+        }
+
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "the invalid \"%V\" parameter", &value[i]);
+        return NGX_CONF_ERROR;
     }
 
-    if (ngx_strcmp(value[2].data, "bind") == 0) {
-        imls->bind = 1;
-        return NGX_CONF_OK;
-    }
-
-    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
-                       "the invalid \"%V\" parameter", &value[2]);
-    return NGX_CONF_ERROR;
+    return NGX_CONF_OK;
 }
 
 
diff --git a/src/mail/ngx_mail_handler.c b/src/mail/ngx_mail_handler.c
index 4cc5e3e..6915dc9 100644
--- a/src/mail/ngx_mail_handler.c
+++ b/src/mail/ngx_mail_handler.c
@@ -118,9 +118,28 @@
     sslcf = ngx_mail_get_module_srv_conf(s, ngx_mail_ssl_module);
 
     if (sslcf->enable) {
+        c->log->action = "SSL handshaking";
+
         ngx_mail_ssl_init_connection(&sslcf->ssl, c);
         return;
     }
+
+    if (imia[i].ssl) {
+
+        c->log->action = "SSL handshaking";
+
+        if (sslcf->ssl.ctx == NULL) {
+            ngx_log_error(NGX_LOG_ERR, c->log, 0,
+                          "no \"ssl_certificate\" is defined "
+                          "in server listening on SSL port");
+            ngx_mail_close_connection(c);
+            return;
+        }
+
+        ngx_mail_ssl_init_connection(&sslcf->ssl, c);
+        return;
+    }
+
     }
 #endif
 
diff --git a/src/mail/ngx_mail_ssl_module.c b/src/mail/ngx_mail_ssl_module.c
index 11a0d1d..dbefb14 100644
--- a/src/mail/ngx_mail_ssl_module.c
+++ b/src/mail/ngx_mail_ssl_module.c
@@ -9,13 +9,16 @@
 #include <ngx_mail.h>
 
 
-#define NGX_DEFAULT_CERTIFICATE      "cert.pem"
-#define NGX_DEFAULT_CERTIFICATE_KEY  "cert.pem"
 #define NGX_DEFAULT_CIPHERS  "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
 
 
 static void *ngx_mail_ssl_create_conf(ngx_conf_t *cf);
 static char *ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
+
+static char *ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static char *ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
 static char *ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
 
@@ -50,14 +53,14 @@
 
     { ngx_string("ssl"),
       NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
-      ngx_conf_set_flag_slot,
+      ngx_mail_ssl_enable,
       NGX_MAIL_SRV_CONF_OFFSET,
       offsetof(ngx_mail_ssl_conf_t, enable),
       NULL },
 
     { ngx_string("starttls"),
       NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
-      ngx_conf_set_enum_slot,
+      ngx_mail_ssl_starttls,
       NGX_MAIL_SRV_CONF_OFFSET,
       offsetof(ngx_mail_ssl_conf_t, starttls),
       ngx_http_starttls_state },
@@ -194,14 +197,12 @@
     ngx_mail_ssl_conf_t *prev = parent;
     ngx_mail_ssl_conf_t *conf = child;
 
+    char                *mode;
     ngx_pool_cleanup_t  *cln;
 
     ngx_conf_merge_value(conf->enable, prev->enable, 0);
-    ngx_conf_merge_value(conf->starttls, prev->starttls, NGX_MAIL_STARTTLS_OFF);
-
-    if (conf->enable == 0 && conf->starttls == NGX_MAIL_STARTTLS_OFF) {
-        return NGX_CONF_OK;
-    }
+    ngx_conf_merge_uint_value(conf->starttls, prev->starttls,
+                         NGX_MAIL_STARTTLS_OFF);
 
     ngx_conf_merge_value(conf->session_timeout,
                          prev->session_timeout, 300);
@@ -213,11 +214,8 @@
                          (NGX_CONF_BITMASK_SET
                           |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
 
-    ngx_conf_merge_str_value(conf->certificate, prev->certificate,
-                         NGX_DEFAULT_CERTIFICATE);
-
-    ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
-                         NGX_DEFAULT_CERTIFICATE_KEY);
+    ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
+    ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
 
     ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
 
@@ -226,6 +224,49 @@
 
     conf->ssl.log = cf->log;
 
+    if (conf->enable) {
+       mode = "ssl";
+
+    } else if (conf->starttls != NGX_MAIL_STARTTLS_OFF) {
+       mode = "starttls";
+
+    } else {
+       mode = "";
+    }
+
+    if (*mode) {
+
+        if (conf->certificate.len == 0) {
+            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
+                          "no \"ssl_certificate\" is defined for "
+                          "the \"%s\" directive in %s:%ui",
+                          mode, conf->file, conf->line);
+            return NGX_CONF_ERROR;
+        }
+
+        if (conf->certificate_key.len == 0) {
+            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
+                          "no \"ssl_certificate_key\" is defined for "
+                          "the \"%s\" directive in %s:%ui",
+                          mode, conf->file, conf->line);
+            return NGX_CONF_ERROR;
+        }
+
+    } else {
+
+        if (conf->certificate.len == 0) {
+            return NGX_CONF_OK;
+        }
+
+        if (conf->certificate_key.len == 0) {
+            ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
+                          "no \"ssl_certificate_key\" is defined "
+                          "for certificate \"%V\"",
+                          &conf->certificate);
+            return NGX_CONF_ERROR;
+        }
+    }
+
     if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
         return NGX_CONF_ERROR;
     }
@@ -292,6 +333,58 @@
 
 
 static char *
+ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_mail_ssl_conf_t  *scf = conf;
+
+    char  *rv;
+
+    rv = ngx_conf_set_flag_slot(cf, cmd, conf);
+
+    if (rv != NGX_CONF_OK) {
+        return rv;
+    }
+
+    if (scf->enable && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "\"starttls\" directive conflicts with \"ssl on\"");
+        return NGX_CONF_ERROR;
+    }
+
+    scf->file = cf->conf_file->file.name.data;
+    scf->line = cf->conf_file->line;
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_mail_ssl_conf_t  *scf = conf;
+
+    char  *rv;
+
+    rv = ngx_conf_set_enum_slot(cf, cmd, conf);
+
+    if (rv != NGX_CONF_OK) {
+        return rv;
+    }
+
+    if (scf->enable == 1 && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "\"ssl\" directive conflicts with \"starttls\"");
+        return NGX_CONF_ERROR;
+    }
+
+    scf->file = cf->conf_file->file.name.data;
+    scf->line = cf->conf_file->line;
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
 ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
     ngx_mail_ssl_conf_t  *scf = conf;
diff --git a/src/mail/ngx_mail_ssl_module.h b/src/mail/ngx_mail_ssl_module.h
index b8d2bdf..b27da41 100644
--- a/src/mail/ngx_mail_ssl_module.h
+++ b/src/mail/ngx_mail_ssl_module.h
@@ -20,12 +20,11 @@
 
 typedef struct {
     ngx_flag_t       enable;
+    ngx_flag_t       prefer_server_ciphers;
 
     ngx_ssl_t        ssl;
 
-    ngx_flag_t       prefer_server_ciphers;
-    ngx_flag_t       starttls;
-
+    ngx_uint_t       starttls;
     ngx_uint_t       protocols;
 
     ssize_t          builtin_session_cache;
@@ -39,6 +38,9 @@
     ngx_str_t        ciphers;
 
     ngx_shm_zone_t  *shm_zone;
+
+    u_char          *file;
+    ngx_uint_t       line;
 } ngx_mail_ssl_conf_t;