diff --git a/include/curl/curl.h b/include/curl/curl.h
index c7a052d1e1d20df044c3941b876e7675f2c1911d..e8ec9eee664c565eb7f80552221294e8756c01fa 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -1527,9 +1527,12 @@ typedef enum {
   /* Enable/disable specific SSL features with a bitmask, see CURLSSLOPT_* */
   CINIT(SSL_OPTIONS, LONG, 216),
 
-  /* set the SMTP auth originator */
+  /* Set the SMTP auth originator */
   CINIT(MAIL_AUTH, OBJECTPOINT, 217),
 
+  /* Enable/disable SASL initial response */
+  CINIT(SASL_IR, LONG, 218),
+
   CURLOPT_LASTENTRY /* the last unused */
 } CURLoption;
 
diff --git a/lib/url.c b/lib/url.c
index b1ba8f1df851261239fe7c0ff4b20d2b93651a33..e116a5b6801181e7471e05e7c2a9c7a8c8a1d4f5 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2246,20 +2246,27 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
     break;
 
   case CURLOPT_MAIL_FROM:
+    /* Set the SMTP mail originator */
     result = setstropt(&data->set.str[STRING_MAIL_FROM],
                        va_arg(param, char *));
     break;
 
   case CURLOPT_MAIL_AUTH:
+    /* Set the SMTP auth originator */
     result = setstropt(&data->set.str[STRING_MAIL_AUTH],
                        va_arg(param, char *));
     break;
 
   case CURLOPT_MAIL_RCPT:
-    /* get a list of mail recipients */
+    /* Set the list of mail recipients */
     data->set.mail_rcpt = va_arg(param, struct curl_slist *);
     break;
 
+  case CURLOPT_SASL_IR:
+    /* Enable/disable SASL initial response */
+    data->set.sasl_ir = (0 != va_arg(param, long)) ? TRUE : FALSE;
+    break;
+
   case CURLOPT_RTSP_REQUEST:
     {
       /*
diff --git a/lib/urldata.h b/lib/urldata.h
index 092398b284984b94efe4f891e3eddb327653bb4d..55f4884f98539c4d504434ad212360201ffb5067 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -1563,6 +1563,7 @@ struct UserDefined {
   long socks5_gssapi_nec; /* flag to support nec socks5 server */
 #endif
   struct curl_slist *mail_rcpt; /* linked list of mail recipients */
+  bool sasl_ir;         /* Enable/disable SASL initial response */
   /* Common RTSP header options */
   Curl_RtspReq rtspreq; /* RTSP request type */
   long rtspversion; /* like httpversion, for RTSP */