diff --git a/mail/compose_email.anubis b/mail/compose_email.anubis
index 8fa9b58..f0883ec 100644
--- a/mail/compose_email.anubis
+++ b/mail/compose_email.anubis
@@ -331,6 +331,31 @@ public define String
   else
     encode_plain_text_content(split_lines(content), []) + crlf.
 
+public define String
+  make_alternative
+  (
+    String  email_id,
+    String  text_part_content,
+    String  html_part_content
+  )=
+  if length(text_part_content) > 0 & length(html_part_content) > 0 then
+    //multipart alternative
+    with boundary = "=_alternative_"+email_id+"_=",
+    "Content-Type: multipart/alternative;" + crlf + 
+    " boundary=\"" + boundary + "\"" + crlf + 
+    crlf +
+    "--" + boundary + crlf +
+    text_part_content + crlf + 
+    "--" + boundary + crlf +
+    html_part_content + crlf + 
+    "--" + boundary + "--"
+  else if length(text_part_content) > 0 then
+    text_part_content
+  else 
+    html_part_content
+    
+.
+
 
 public define String
   compose_mail
@@ -338,24 +363,33 @@ public define String
     Email_to_send   send
   ) =
   //with header_to_name = "To: ",
-  if send is data_to_send(from, to_list, cc_list, bcc_list, subject, content, files, send_copy, reply_to) then
+  if send is data_to_send(from, to_list, cc_list, bcc_list, subject, text_content, html_content, files, send_copy, reply_to) then
     with send_date = get_rfc822_date_format,
-         text_type  = if find("<html",content,0) is
-                      {
-                        failure    then "plain",
-                        success(_) then "html"
-                      },
-         data_text = "Content-Type: text/" + text_type + "; charset=UTF-8" + crlf +
-                     "Content-Transfer-Encoding: 8bit" + crlf +
-                     crlf +
-                     encode_content(content, text_type = "html"),
-         is_multipart = if files is
-                        {
-                          []      then false,
-                          [h . t] then true
-                        },
+    with  email_id = to_ascii(sha1((from, send_date))),
+         data_text = if length(text_content) > 0 then 
+                      "Content-Type: text/plain; charset=UTF-8" + crlf +
+                      "Content-Transfer-Encoding: 8bit" + crlf +
+                      crlf +
+                      encode_content(text_content, false)
+                     else
+                      "",
+         data_html = if length(html_content) > 0 then 
+                      "Content-Type: text/html; charset=UTF-8" + crlf +
+                      "Content-Transfer-Encoding: 8bit" + crlf +
+                      crlf +
+                      encode_content(html_content, true)
+                     else
+                      "",
+         body_text = make_alternative(email_id, data_text, data_html),
+         
+         is_multipart = if length(files) > 0 then true else false,
+//                        is
+//                        {
+//                          []      then false,
+//                          [h . t] then true
+//                        },
     
-    "Message-ID: " + to_ascii(sha1((from, send_date))) + crlf +
+    "Message-ID: " + email_id + crlf +
     "Date: " + send_date + crlf +
    // "From: " + user.login + "<" + user.login + "@" + domain + ">" + crlf +
     "User-Agent: Anubis XLib email sender" + crlf +
@@ -380,19 +414,19 @@ public define String
         "Subject: " + to_folded_base64_text("UTF-8", subject) + crlf
     ) +
     if is_multipart then
-      with boundary = to_ascii(sha1((from, send_date))),
+      with boundary = "=_mixed_"+email_id+"_=",
       "Content-Type: multipart/mixed;" + crlf + 
       " boundary=\"" + boundary + "\"" + crlf + 
       crlf +
       "This is a multi-part message in MIME format." + crlf +  
       "--" + boundary + crlf +
-      data_text + crlf + 
+      body_text + crlf + 
       
       data_files_multipart(files, boundary) + 
       
       "--" + boundary + "--"
     else
-      data_text
+      body_text
   .
 
 
diff --git a/mail/types/generated/email_to_send.anubis b/mail/types/generated/email_to_send.anubis
index fbf89ff..d404abb 100644
--- a/mail/types/generated/email_to_send.anubis
+++ b/mail/types/generated/email_to_send.anubis
@@ -1,4 +1,4 @@
-/*
+/*
  * Created by 伝作 (Densaku).
  * Types & Messages generator written by フランスのトトロ aka (David RENÉ)
  * Date: 2020-04-01
@@ -10,8 +10,8 @@ transmit system/muscle.anubis
 transmit system/convert.anubis
 transmit tools/basis.anubis
 
-transmit types/generated/file_ref.anubis
-transmit types/generated/email_address.anubis
+transmit calexium_lib/types/generated/file_ref.anubis
+transmit calexium_lib/mail/types/generated/email_address.anubis
 
 
 
--
libgit2 0.21.4