Sending MIME Mails

[Andreas Höschler]

Hi all,

I used to send MIME mails with attachments as follows:

#define SENDMAIL "/usr/lib/sendmail -t"

+ (void)sendMailFrom:(NSString *)from to:(NSString *)to 
subject:(NSString *)subject body:(NSString *)body attachments:(NSArray 
*)attachments
{
   FILE *out = popen(SENDMAIL, "w");
   fprintf(out, "From: %s\n", [from cString]);
   fprintf(out, "To: %s\n", [to cString]);
   fprintf(out, "Subject: %s\n", [subject cString]);

   if ([attachments count]) // MIME message
     {
      NSEnumerator *enumerator = [attachments objectEnumerator];
      NSDictionary *dic;
      NSString *mime_boundary = 
@"-1747901728-1448367683-913849620=:4553";

      fprintf(out, "MIME-Version: 1.0\n");
      fprintf(out, "Content-Type: multipart/mixed; BOUNDARY=\"%s\"\n", 
[mime_boundary cString]);
      fprintf(out, "\n");

      // write dummy message body
      fprintf(out,"  This message is in MIME format.  The first part 
should be readable text,\n");
      fprintf(out,"  while the remaining parts are likely unreadable 
without MIME-aware tools.\n");
      fprintf(out,"  Send mail to mime@docserver.cac.washington.edu for 
more info.\n");
      fprintf(out,"\n");

      // write message text
      fprintf(out, "--%s\n", [mime_boundary cString]);
      fprintf(out, "Content-Type: text/plain; charset=US-ASCII\n");
      fprintf(out,"\n");
      fprintf(out, [body cString]);
      fprintf(out,"\n");

      while (dic = [enumerator nextObject])
        {
         NSString *filename = [dic objectForKey:@"filename"];
         NSData *data = [dic objectForKey:@"data"];
         NSData *encodedData = [GSMimeDocument encodeBase64:data];

         fprintf(out,"--%s\n", [mime_boundary cString]);
         fprintf(out,"Content-Type: %s; name=\"%s\"\n", [[self 
guessMIMEType:filename] cString], [[self basename:filename] cString]);
         fprintf(out,"Content-Transfer-Encoding: base64\n");
         fprintf(out,"Content-Description:\n");
         fprintf(out,"\n");

         // mime kodierte Daten des attachments ausgeben
         if (encodedData)
           {
            int i, length = [encodedData length];
            const char *pChar = [encodedData bytes];
            for (i = 0 ; i < length ; i++)
              {
               putc(*pChar, out);
               pChar++;
              }
            fprintf(out,"\r\n");
           }
        }

      fprintf(out, "--%s--\n", [mime_boundary cString]);
     }
   else
     {
      fprintf(out, "\n");
      fprintf(out, [body cString]);
     }
   pclose(out);
}

If I remember correctly this worked with an older version of GNUstep 
(but I could also be wrong here). I just tried that with the latest 
GNUstep release. The mail is sent (of course) but the attachment does 
not get through correctly. PDF or TIFFs or whatever cannot be opened on 
the other end. It seems that Mail.app does not do the back conversion 
from base64 to binary format. What am I missing?

Thanks a lot!

Regards,

  Andreas