Enable mutt 1.5.21 to send attachments conforming to RFC 2047

readme.md

Modified on the basis of http://www.emaillab.org/mutt/1.5.10/patch-1.5.10.tt.create_rfc2047_params.1.gz

patch-1.5.21.tt.create_rfc2047_params.1.patch

diff -uNr mutt-1.5.21.orig/PATCHES mutt-1.5.21/PATCHES
--- mutt-1.5.21.orig/PATCHES  2008-03-20 04:07:06.000000000 +0800
+++ mutt-1.5.21/PATCHES	2013-05-28 14:12:57.000000000 +0800
@@ -0,0 +1 @@
+patch-1.5.21.tt.create_rfc2047_params.1
diff -uNr mutt-1.5.21.orig/init.h mutt-1.5.21/init.h
--- mutt-1.5.21.orig/init.h	2010-09-15 23:39:31.000000000 +0800
+++ mutt-1.5.21/init.h	2013-05-28 10:50:19.000000000 +0800
@@ -419,6 +419,18 @@
   ** characters as question marks which can lead to undesired
   ** side effects (for example in regular expressions).
   */
+  { "create_rfc2047_parameters", DT_BOOL, R_NONE, OPTCREATERFC2047PARAMS, 0 },
+  /*
+  ** .pp
+  ** When this variable is set, Mutt will add the following RFC-2047-encoded
+  ** MIME parameter to Content-Type header field as filename for attachment:
+  ** name="=?iso-2022-jp?B?GyRCO244MxsoQi50eHQ=?="
+  ** .pp
+  ** Note: this use of RFC 2047's encoding is explicitly prohibited
+  ** by the standard. You may set this variable only if a mailer
+  ** of recipients can not parse RFC 2231 parameters.
+  */
+
   { "confirmappend",	DT_BOOL, R_NONE, OPTCONFIRMAPPEND, 1 },
   /*
   ** .pp
diff -uNr mutt-1.5.21.orig/mutt.h mutt-1.5.21/mutt.h
--- mutt-1.5.21.orig/mutt.h	2010-09-14 01:19:55.000000000 +0800
+++ mutt-1.5.21/mutt.h	2013-05-28 10:52:06.000000000 +0800
@@ -331,6 +330,7 @@
   OPTCOLLAPSEUNREAD,
   OPTCONFIRMAPPEND,
   OPTCONFIRMCREATE,
+  OPTCREATERFC2047PARAMS,
   OPTDELETEUNTAG,
   OPTDIGESTCOLLAPSE,
   OPTDUPTHREADS,
diff -uNr mutt-1.5.21.orig/sendlib.c mutt-1.5.21/sendlib.c
--- mutt-1.5.21.orig/sendlib.c	2010-09-14 01:19:55.000000000 +0800
+++ mutt-1.5.21/sendlib.c	2013-05-28 11:16:26.000000000 +0800
@@ -347,6 +347,33 @@
 
     }
   }
+  if (a->use_disp && option (OPTCREATERFC2047PARAMS))
+  {
+    if(!(fn = a->d_filename))
+      fn = a->filename;
+
+    if (fn)
+    {
+      char *tmp;
+
+      /* Strip off the leading path... */
+      if ((t = strrchr (fn, '/')))
+	t++;
+      else
+        t = fn;
+
+      /* length of content-type */
+      len = 21 + mutt_strlen (TYPE (a)) + mutt_strlen (a->subtype);
+
+      buffer[0] = 0;
+      tmp = safe_strdup (t);
+      _rfc2047_encode_string (&tmp, 0, len);
+      rfc822_cat (buffer, sizeof (buffer), tmp, MimeSpecials);
+      FREE (&tmp);
+      fprintf (f, "; name=%s", buffer);
+    }
+  }
+
 
   fputc ('\n', f);
 

Usage: patch, compile, edit .muttrc:

Add the line

set create_rfc2047_parameters=yes

restart mutt. All email attachments sent are now conforming to rfc 2047 and therefore can be read by Foxmail and older versions of Outlook (Express). You can also set send-hook to limit the behaviour to sending to certain addresses.