diff --git a/debian/patches/37_check_smtp_Adding_SNI b/debian/patches/37_check_smtp_Adding_SNI
new file mode 100644
index 0000000..e92731b
--- /dev/null
+++ b/debian/patches/37_check_smtp_Adding_SNI
@@ -0,0 +1,86 @@
+From 252272344ea63a164eabc1631e9b77450d2b1c4b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Arkadiusz=20Mi=C5=9Bkiewicz?= <arekm@maven.pl>
+Date: Fri, 30 Aug 2019 11:30:10 +0200
+Subject: [PATCH 1/2] Add support for SNI in check_smtp.
+
+Add support for SSL/TLS hostname extension support (SNI) for check_smtp
+plugin.
+
+Backported from nagios-plugins:
+https://github.com/nagios-plugins/nagios-plugins/commit/9f1628f4b5525335ce1d6e48e8ac8b07d0757f82
+---
+ plugins/check_smtp.c | 19 +++++++++++++++++--
+ 1 file changed, 17 insertions(+), 2 deletions(-)
+
+diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
+index 70191ad92..c0ab838ac 100644
+--- a/plugins/check_smtp.c
++++ b/plugins/check_smtp.c
+@@ -103,6 +103,7 @@ double critical_time = 0;
+ int check_critical_time = FALSE;
+ int verbose = 0;
+ int use_ssl = FALSE;
++int use_sni = FALSE;
+ short use_proxy_prefix = FALSE;
+ short use_ehlo = FALSE;
+ short use_lhlo = FALSE;
+@@ -234,7 +235,7 @@ main (int argc, char **argv)
+ 		    smtp_quit();
+ 		    return STATE_UNKNOWN;
+ 		  }
+-		  result = np_net_ssl_init(sd);
++		  result = np_net_ssl_init_with_hostname(sd, (use_sni ? server_address : NULL));
+ 		  if(result != STATE_OK) {
+ 		    printf (_("CRITICAL - Cannot create SSL context.\n"));
+ 		    close(sd);
+@@ -463,6 +464,10 @@ process_arguments (int argc, char **argv)
+ 	int c;
+ 	char* temp;
+ 
++	enum {
++	  SNI_OPTION
++	};
++
+ 	int option = 0;
+ 	static struct option longopts[] = {
+ 		{"hostname", required_argument, 0, 'H'},
+@@ -485,6 +490,7 @@ process_arguments (int argc, char **argv)
+ 		{"help", no_argument, 0, 'h'},
+ 		{"lmtp", no_argument, 0, 'L'},
+ 		{"starttls",no_argument,0,'S'},
++		{"sni", no_argument, 0, SNI_OPTION},
+ 		{"certificate",required_argument,0,'D'},
+ 		{"ignore-quit-failure",no_argument,0,'q'},
+ 		{"proxy",no_argument,0,'r'},
+@@ -631,6 +637,13 @@ process_arguments (int argc, char **argv)
+ 			use_ssl = TRUE;
+ 			use_ehlo = TRUE;
+ 			break;
++		case SNI_OPTION:
++#ifdef HAVE_SSL
++			use_sni = TRUE;
++#else
++			usage (_("SSL support not available - install OpenSSL and recompile"));
++#endif
++			break;
+ 		case 'r':
+ 			use_proxy_prefix = TRUE;
+ 			break;
+@@ -839,6 +852,8 @@ print_help (void)
+   printf ("    %s\n", _("Minimum number of days a certificate has to be valid."));
+   printf (" %s\n", "-S, --starttls");
+   printf ("    %s\n", _("Use STARTTLS for the connection."));
++  printf (" %s\n", "--sni");
++  printf ("    %s\n", _("Enable SSL/TLS hostname extension support (SNI)"));
+ #endif
+ 
+ 	printf (" %s\n", "-A, --authtype=STRING");
+@@ -875,6 +890,6 @@ print_usage (void)
+   printf ("%s\n", _("Usage:"));
+   printf ("%s -H host [-p port] [-4|-6] [-e expect] [-C command] [-R response] [-f from addr]\n", progname);
+   printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout] [-q]\n");
+-  printf ("[-F fqdn] [-S] [-L] [-D warn days cert expire[,crit days cert expire]] [-r] [-v] \n");
++  printf ("[-F fqdn] [-S] [-L] [-D warn days cert expire[,crit days cert expire]] [-r] [--sni] [-v] \n");
+ }
+ 
+
diff --git a/debian/patches/series b/debian/patches/series
index e0639fc..f3436e7 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -23,3 +23,4 @@
 33_check_procs_exclude-process
 34_check_curl_fix_compare_warning
 36_check_smtp_adding_proxy_header
+37_check_smtp_Adding_SNI