diff --git a/src/OS/os.h-Linux b/src/OS/os.h-Linux
index 3fead17..03fea75 100644
--- a/src/OS/os.h-Linux
+++ b/src/OS/os.h-Linux
@@ -20,7 +20,7 @@ performance on outgoing mail a bit. Note: With older glibc versions
 this setting will conflict with the _FILE_OFFSET_BITS=64 setting
 defined as part of the Linux CFLAGS. */
 
-/* #define HAVE_LINUX_SENDFILE */
+#define HAVE_LINUX_SENDFILE 
 
 #define F_FREESP     O_TRUNC
 typedef struct flock flock_t;
diff --git a/src/src/expand.c b/src/src/expand.c
index 1da2225..7da567a 100644
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -618,6 +618,7 @@ static var_entry var_table[] = {
   { "sn8",                 vtype_filter_int,  &filter_sn[8] },
   { "sn9",                 vtype_filter_int,  &filter_sn[9] },
 #ifdef WITH_CONTENT_SCAN
+  { "spam_action",         vtype_stringptr,   &spam_action },
   { "spam_bar",            vtype_stringptr,   &spam_bar },
   { "spam_report",         vtype_stringptr,   &spam_report },
   { "spam_score",          vtype_stringptr,   &spam_score },
diff --git a/src/src/globals.c b/src/src/globals.c
index 74b6edb..e6f02fb 100644
--- a/src/src/globals.c
+++ b/src/src/globals.c
@@ -1212,6 +1212,7 @@ BOOL    smtp_use_size          = FALSE;
 uschar *spamd_address          = US"127.0.0.1 783";
 uschar *spam_bar               = NULL;
 uschar *spam_report            = NULL;
+uschar *spam_action            = NULL;
 uschar *spam_score             = NULL;
 uschar *spam_score_int         = NULL;
 #endif
diff --git a/src/src/globals.h b/src/src/globals.h
index db436c0..fc4d9f6 100644
--- a/src/src/globals.h
+++ b/src/src/globals.h
@@ -769,6 +769,7 @@ extern BOOL    smtp_use_size;          /* Global for passed connections */
 extern uschar *spamd_address;          /* address for the spamassassin daemon */
 extern uschar *spam_bar;               /* the spam "bar" (textual representation of spam_score) */
 extern uschar *spam_report;            /* the spamd report (multiline) */
+extern uschar *spam_action;            /* the spamd action */
 extern uschar *spam_score;             /* the spam score (float) */
 extern uschar *spam_score_int;         /* spam_score * 10 (int) */
 #endif
diff --git a/src/src/spam.c b/src/src/spam.c
index 63395f2..41fd4ac 100644
--- a/src/src/spam.c
+++ b/src/src/spam.c
@@ -14,12 +14,20 @@
 uschar spam_score_buffer[16];
 uschar spam_score_int_buffer[16];
 uschar spam_bar_buffer[128];
+uschar spam_action_buffer[32];
 uschar spam_report_buffer[32600];
 uschar prev_user_name[128] = "";
 int spam_ok = 0;
 int spam_rc = 0;
 uschar *prev_spamd_address_work = NULL;
 
+/* push formatted line into vector */
+static int spam_push_line(struct iovec *iov, int i, const char *fmt, ...);
+/* write io vector to the socket */
+static int spam_write_vector(int sock, size_t size, struct iovec *iov, time_t now);
+/* poll socket to obtain write readiness */
+static int spam_poll_socket (int sock, time_t start);
+
 int spam(uschar **listptr) {
   int sep = 0;
   uschar *list = *listptr;
@@ -29,10 +37,11 @@ int spam(uschar **listptr) {
   FILE *mbox_file;
   int spamd_sock = -1;
   uschar spamd_buffer[32600];
-  int i, j, offset, result;
+  int i, j, offset, result, is_rspamd;
   uschar spamd_version[8];
+  uschar spamd_short_result[8];
   uschar spamd_score_char;
-  double spamd_threshold, spamd_score;
+  double spamd_threshold, spamd_score, spamd_reject_score;
   int spamd_report_offset;
   uschar *p,*q;
   int override = 0;
@@ -126,8 +135,15 @@ int spam(uschar **listptr) {
       spamd_address_container *this_spamd =
         (spamd_address_container *)store_get(sizeof(spamd_address_container));
 
+      /* Check for spamd variant */
+      if( Ustrstr(address, "variant=rspamd") != NULL ) {
+        this_spamd->is_rspamd = 1;  
+      }
+      else {
+        this_spamd->is_rspamd = 0;  
+      }
       /* grok spamd address and port */
-      if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) {
+      if( sscanf(CS address, "%s %hu", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) {
         log_write(0, LOG_MAIN,
           "spam acl condition: warning - invalid spamd address: '%s'", address);
         continue;
@@ -171,6 +187,7 @@ int spam(uschar **listptr) {
                       spamd_address_vector[current_server]->tcp_port,
                       5 ) > -1) {
         /* connection OK */
+        is_rspamd = spamd_address_vector[current_server]->is_rspamd;
         break;
       };
 
@@ -207,12 +224,28 @@ int spam(uschar **listptr) {
     }
 
     server.sun_family = AF_UNIX;
-    Ustrcpy(server.sun_path, spamd_address_work);
+    p = Ustrstr(spamd_address_work, "variant=rspamd");
+    if( p != NULL ) {
+      is_rspamd = TRUE;
+      /* strip spaces */
+      p --;
+      while (p > spamd_address_work && isspace (*p)) {
+        p --;
+      }
+      Ustrncpy(server.sun_path, spamd_address_work, p - spamd_address_work + 1);
+      /* zero terminate */
+      server.sun_path[p - spamd_address_work + 1] = 0;
+    }
+    else {
+      is_rspamd = FALSE;  
+      Ustrcpy(server.sun_path, spamd_address_work);
+    }
+
 
     if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
       log_write(0, LOG_MAIN|LOG_PANIC,
                 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
-                spamd_address_work, strerror(errno) );
+                server.sun_path, strerror(errno) );
       (void)fclose(mbox_file);
       (void)close(spamd_sock);
       return DEFER;
@@ -228,22 +261,67 @@ int spam(uschar **listptr) {
     return DEFER;
   }
 
+  (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK);
   /* now we are connected to spamd on spamd_sock */
-  (void)string_format(spamd_buffer,
-           sizeof(spamd_buffer),
-           "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
-           user_name,
-           mbox_size);
-
-  /* send our request */
-  if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) {
-    (void)close(spamd_sock);
-    log_write(0, LOG_MAIN|LOG_PANIC,
-         "spam acl condition: spamd send failed: %s", strerror(errno));
-    (void)fclose(mbox_file);
-    (void)close(spamd_sock);
-    return DEFER;
-  };
+  if (is_rspamd) { 
+    /* rspamd variant */
+    int r, request_p = 0;
+    const char *helo;
+    struct iovec *request_v;
+    
+    request_v = store_get(sizeof(struct iovec) * (8 + recipients_count));
+    if (request_v == NULL) {
+      (void)close(spamd_sock);
+      log_write(0, LOG_MAIN|LOG_PANIC,
+        "spam acl condition: store_get failed: %s", strerror(errno));
+      (void)fclose(mbox_file);
+      (void)close(spamd_sock);
+      return DEFER;
+    }
+    r = 0;
+    r += spam_push_line(request_v, request_p++, "CHECK RSPAMC/1.3\r\n");
+    r += spam_push_line(request_v, request_p++, "Content-length: %lu\r\n", mbox_size);
+    r += spam_push_line(request_v, request_p++, "Queue-Id: %s\r\n", message_id);
+    r += spam_push_line(request_v, request_p++, "From: <%s>\r\n", sender_address);
+    r += spam_push_line(request_v, request_p++, "Recipient-Number: %d\r\n", recipients_count);
+    /* copy all recipients as well */
+    for (i = 0; i < recipients_count; i ++)
+        r += spam_push_line(request_v, request_p++, "Rcpt: <%s>\r\n", recipients_list[i].address);
+    if ((helo = expand_string(US"$sender_helo_name")) != NULL && *helo != '\0')
+      r += spam_push_line(request_v, request_p++, "Helo: %s\r\n", helo);
+    if (sender_host_address != NULL)
+      r += spam_push_line(request_v, request_p++, "IP: %s\r\n", sender_host_address);
+    r += spam_push_line(request_v, request_p++, "\r\n");
+    if (spam_write_vector (spamd_sock, request_p, request_v, start) < 0) {
+        (void)close(spamd_sock);
+        log_write(0, LOG_MAIN|LOG_PANIC,
+            "spam acl condition: spamd (rspamd) send failed: %s", strerror(errno));
+        (void)fclose(mbox_file);
+        (void)close(spamd_sock);
+        return DEFER;
+    }
+  }
+  else {
+    /* spamassassin variant */
+    struct iovec req_iov;
+    (void)string_format(spamd_buffer,
+            sizeof(spamd_buffer),
+            "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
+            user_name,
+            mbox_size);
+    /* send our request */
+    req_iov.iov_len = Ustrlen(spamd_buffer);
+    req_iov.iov_base = spamd_buffer;
+    if (spam_write_vector (spamd_sock, 1, &req_iov, start) < 0) {
+        (void)close(spamd_sock);
+        log_write(0, LOG_MAIN|LOG_PANIC,
+            "spam acl condition: spamd send failed: %s", strerror(errno));
+        (void)fclose(mbox_file);
+        (void)close(spamd_sock);
+        return DEFER;
+    };
+  }
+
 
   /* now send the file */
   /* spamd sometimes accepts conections but doesn't read data off
@@ -255,41 +333,53 @@ int spam(uschar **listptr) {
    * Note: poll() is not supported in OSX 10.2 and is reported to be
    *       broken in more recent versions (up to 10.4).
    */
-#ifndef NO_POLL_H
-  pollfd.fd = spamd_sock;
-  pollfd.events = POLLOUT;
-#endif
-  (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK);
+#ifdef HAVE_LINUX_SENDFILE
+  ssize_t copied = 0;
+  int mbox_fd;
+  off_t off = 0, size;
+  struct stat st;
+
+  mbox_fd = fileno(mbox_file);
+  if( fstat(mbox_fd, &st) == -1 ) {
+    log_write(0, LOG_MAIN|LOG_PANIC,
+      "spam acl condition: %s on scan file", strerror(errno));
+    (void)close(spamd_sock);
+    (void)fclose(mbox_file);
+    return DEFER;
+  }
+  size = st.st_size;
+  for (;;) {
+    if (spam_poll_socket(spamd_sock, start) == -1) {
+      (void)close(spamd_sock);
+      (void)fclose(mbox_file);
+      return DEFER;
+    }
+    copied = sendfile(spamd_sock, mbox_fd, &offset, (size - offset));
+    if (copied < 0) {
+      if (errno == EINTR)
+        continue;
+
+      log_write(0, LOG_MAIN|LOG_PANIC,
+        "spam acl condition: %s on spamd socket", strerror(errno));
+      (void)close(spamd_sock);
+      (void)fclose(mbox_file);
+      return DEFER;
+    }
+    else {
+      size -= copied;
+      if (size == 0) {
+        /* the whole file has been sent */
+        break;
+      }
+    }
+  }
+#else
   do {
     read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file);
     if (read > 0) {
       offset = 0;
 again:
-#ifndef NO_POLL_H
-      result = poll(&pollfd, 1, 1000);
-
-/* Patch posted by Erik ? for OS X and applied by PH */
-#else
-      select_tv.tv_sec = 1;
-      select_tv.tv_usec = 0;
-      FD_ZERO(&select_fd);
-      FD_SET(spamd_sock, &select_fd);
-      result = select(spamd_sock+1, NULL, &select_fd, NULL, &select_tv);
-#endif
-/* End Erik's patch */
-
-      if (result == -1 && errno == EINTR)
-        goto again;
-      else if (result < 1) {
-        if (result == -1)
-          log_write(0, LOG_MAIN|LOG_PANIC,
-            "spam acl condition: %s on spamd socket", strerror(errno));
-        else {
-          if (time(NULL) - start < SPAMD_TIMEOUT)
-          goto again;
-          log_write(0, LOG_MAIN|LOG_PANIC,
-            "spam acl condition: timed out writing spamd socket");
-        }
+      if (spam_poll_socket(spamd_sock, start) == -1) {
         (void)close(spamd_sock);
         (void)fclose(mbox_file);
         return DEFER;
@@ -318,6 +408,7 @@ again:
     (void)fclose(mbox_file);
     return DEFER;
   }
+#endif /* HAVE_LINUX_SENDFILE */
 
   (void)fclose(mbox_file);
 
@@ -346,60 +437,103 @@ again:
   /* reading done */
   (void)close(spamd_sock);
 
-  /* dig in the spamd output and put the report in a multiline header, if requested */
-  if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
-             spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
+  if (!is_rspamd) {
+    /* dig in the spamd output and put the report in a multiline header, if requested */
+    if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
+                spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
 
-    /* try to fall back to pre-2.50 spamd output */
-    if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
-               spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
-      log_write(0, LOG_MAIN|LOG_PANIC,
-         "spam acl condition: cannot parse spamd output");
-      return DEFER;
+        /* try to fall back to pre-2.50 spamd output */
+        if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
+                spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
+        log_write(0, LOG_MAIN|LOG_PANIC,
+            "spam acl condition: cannot parse spamd output");
+        return DEFER;
+        };
     };
-  };
 
-  /* Create report. Since this is a multiline string,
-  we must hack it into shape first */
-  p = &spamd_buffer[spamd_report_offset];
-  q = spam_report_buffer;
-  while (*p != '\0') {
-    /* skip \r */
-    if (*p == '\r') {
-      p++;
-      continue;
-    };
-    *q = *p;
-    q++;
-    if (*p == '\n') {
-      /* add an extra space after the newline to ensure
-      that it is treated as a header continuation line */
-      *q = ' ';
-      q++;
+    /* Create report. Since this is a multiline string,
+    we must hack it into shape first */
+    p = &spamd_buffer[spamd_report_offset];
+    q = spam_report_buffer;
+    while (*p != '\0') {
+        /* skip \r */
+        if (*p == '\r') {
+        p++;
+        continue;
+        };
+        *q = *p;
+        q++;
+        if (*p == '\n') {
+        /* add an extra space after the newline to ensure
+        that it is treated as a header continuation line */
+        *q = ' ';
+        q++;
+        };
+        p++;
     };
-    p++;
-  };
-  /* NULL-terminate */
-  *q = '\0';
-  q--;
-  /* cut off trailing leftovers */
-  while (*q <= ' ') {
+    /* NULL-terminate */
     *q = '\0';
     q--;
-  };
+    /* cut off trailing leftovers */
+    while (*q <= ' ') {
+        *q = '\0';
+        q--;
+    };
+    if( spamd_score >= spamd_threshold ) {
+      Ustrcpy(spam_action_buffer, "reject");
+    }
+    else {
+      Ustrcpy(spam_action_buffer, "no action");
+    }
+  }
+  else {
+    /* rspamd variant of reply */
+    int r;
+    if( (r = sscanf(CS spamd_buffer,"RSPAMD/%7s 0 EX_OK\r\nMetric: default; %7s %lf / %lf / %lf\r\n%n",
+        spamd_version,spamd_short_result,&spamd_score,&spamd_threshold,&spamd_reject_score,&spamd_report_offset)) != 5 ) {
+      log_write(0, LOG_MAIN|LOG_PANIC,
+            "spam acl condition: cannot parse spamd output: %d", r);
+      return DEFER;
+    };
+    /* now parse action */
+    p = &spamd_buffer[spamd_report_offset];
+
+    if( Ustrncmp(p, "Action: ", sizeof("Action: ") - 1) == 0 ) {
+      p += sizeof("Action: ") - 1;
+      q = &spam_action_buffer[0];
+      while (*p && *p != '\r' && (q - spam_action_buffer) < sizeof(spam_action_buffer) - 1) {
+        *q++ = *p++;
+      }
+      *q = '\0';
+    }
+    /* make a simple report */
+    if( spamd_score >= spamd_threshold ) {
+      p = "likely spam";
+    }
+    else if ( Ustrcmp (spam_action_buffer, "no action") == 0 ) {
+      p = "unlikely spam";
+    }
+    else {
+      p = "probably spam";
+    }
+    string_format(spam_report_buffer, sizeof(spam_report_buffer), "This message is %s.", p);
+  }
+
+  /* common spamd actions */
   spam_report = spam_report_buffer;
+  spam_action = spam_action_buffer;
 
   /* create spam bar */
   spamd_score_char = spamd_score > 0 ? '+' : '-';
   j = abs((int)(spamd_score));
   i = 0;
   if( j != 0 ) {
-    while((i < j) && (i <= MAX_SPAM_BAR_CHARS))
-       spam_bar_buffer[i++] = spamd_score_char;
+      while((i < j) && (i <= MAX_SPAM_BAR_CHARS))
+      spam_bar_buffer[i++] = spamd_score_char;
   }
   else{
-    spam_bar_buffer[0] = '/';
-    i = 1;
+      spam_bar_buffer[0] = '/';
+      i = 1;
   }
   spam_bar_buffer[i] = '\0';
   spam_bar = spam_bar_buffer;
@@ -415,12 +549,12 @@ again:
 
   /* compare threshold against score */
   if (spamd_score >= spamd_threshold) {
-    /* spam as determined by user's threshold */
-    spam_rc = OK;
+      /* spam as determined by user's threshold */
+      spam_rc = OK;
   }
   else {
-    /* not spam */
-    spam_rc = FAIL;
+      /* not spam */
+      spam_rc = FAIL;
   };
 
   /* remember expanded spamd_address if needed */
@@ -440,4 +574,126 @@ again:
   };
 }
 
+#ifdef __GNUC__
+static int
+spam_push_line(struct iovec *iov, const int i, const char *fmt, ...)  __attribute__ ((format (printf, 3, 4)));
+#endif
+static int
+spam_push_line(struct iovec *iov, const int i, const char *fmt, ...)
+{
+  va_list ap;
+  size_t len;
+  char buf[512];
+
+  va_start(ap, fmt);
+  len = vsnprintf(buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+
+  iov[i].iov_base = string_copy(US buf);
+  iov[i].iov_len = len;
+
+  if (len >= sizeof(buf)) {
+    log_write(0, LOG_MAIN, "rspam: error, string was longer than %d", (int)sizeof(buf));
+    return (-1);
+  }
+
+  return 0;
+}
+
+static int 
+spam_write_vector(int sock, size_t size, struct iovec *iov, time_t start)
+{
+  int r, i;
+  
+  for (;;) {
+    if (spam_poll_socket(sock, start) == -1) {
+      return -1;
+    }
+    r = writev(sock, iov, size);
+    if (r == -1) {
+      if (errno == EINTR)
+        continue;
+
+      log_write(0, LOG_MAIN|LOG_PANIC,
+        "spam acl condition: %s on spamd socket", strerror(errno));
+      return -1;
+    }
+    else {
+      /* check for partial writev */
+      for (i = 0; i < size; i ++) {
+        if (r >= iov[i].iov_len) {
+          r -= iov[i].iov_len;
+        }
+        else {
+          /* partial iov write */
+          iov[i].iov_base += r;
+          break;
+        }
+        if (r == 0)
+          break;
+      }
+      
+      if (i == size - 1 && r == 0) {
+        /* we have written everything */
+        break;
+      }
+      else {
+        /* move iov to the last unreaded element */
+        iov = &iov[i];
+        size -= i;
+      }
+    }
+  }
+
+  return 0;
+  
+}
+
+static int
+spam_poll_socket (int sock, time_t start)
+{
+#ifndef NO_POLL_H
+  struct pollfd pollfd;
+#else                               /* Patch posted by Erik ? for OS X */
+  struct timeval select_tv;         /* and applied by PH */
+  fd_set select_fd;
+#endif
+  int r;
+
+#ifndef NO_POLL_H
+  pollfd.fd = sock;
+  pollfd.events = POLLOUT;
+#endif
+  for (;;) {
+#ifndef NO_POLL_H
+    r = poll(&pollfd, 1, 1000);
+
+/* Patch posted by Erik ? for OS X and applied by PH */
+#else
+    select_tv.tv_sec = 1;
+    select_tv.tv_usec = 0;
+    FD_ZERO(&select_fd);
+    FD_SET(sock, &select_fd);
+    r = select(sock+1, NULL, &select_fd, NULL, &select_tv);
+#endif
+/* End Erik's patch */
+
+    if (r == -1 && errno == EINTR)
+      continue;
+    else if (r < 1) {
+      if (r == -1)
+        log_write(0, LOG_MAIN|LOG_PANIC,
+          "spam acl condition: %s on spamd socket", strerror(errno));
+      else {
+        if (time(NULL) - start < SPAMD_TIMEOUT)
+          continue;
+
+        log_write(0, LOG_MAIN|LOG_PANIC,
+          "spam acl condition: timed out writing spamd socket");
+      }
+    }
+    return r;
+  }
+}
+
 #endif
diff --git a/src/src/spam.h b/src/src/spam.h
index ba700c8..6047c59 100644
--- a/src/src/spam.h
+++ b/src/src/spam.h
@@ -22,7 +22,8 @@
 
 typedef struct spamd_address_container {
   uschar tcp_addr[24];
-  unsigned int tcp_port;
+  unsigned short int tcp_port;
+  unsigned is_rspamd:1;
 } spamd_address_container;
 
 #endif