More info here
http://gcastrop.blogspot.com/2011/02/problemas-con-adjuntos-en-simscan-con.html
https://notes.sagredo.eu/en/qmail-notes-185/simscan-38.html#comment1242

diff -ruN simscan-1.4.0 / simscan.c simscan-1.4.0-tested / simscan.c 
--- simscan-1.4.0 / simscan.c 2011-02-08 20: 26: 06.095067924 -0200 
+++ simscan-1.4.0-tested / simscan.c 2011-02-08 18: 16: 11.003064430 -0200 
@@ -1735,10 +1735,14 @@ 
     for (i = 0; i       if (DebugFlag> 2) fprintf (stderr, "simscan: checking attachment% s against% s \ n", mydirent-> d_name, bk_attachments [i]); 
       lowerit (mydirent-> d_name); 
- if (str_rstr (mydirent-> d_name, bk_attachments [i]) == 0) { 
- strncpy (AttachName, mydirent-> d_name, sizeof (AttachName) -1); 
- closedir (mydir); 
- return (1); 
+ if (strlen (mydirent-> d_name)> = strlen (bk_attachments [i])) { 
+ if (str_rstr (mydirent-> d_name, bk_attachments [i]) == 0) { 
+ strncpy (AttachName, mydirent-> d_name , sizeof (AttachName) -1); 
+ closedir (mydir); 
+ return (1); 
+} 
+} else {
+ if (DebugFlag> 2) fprintf (stderr, "simscan: attachment name '% s' (% d) is shorter than '% s' (% d). IGNORED \ n", mydirent-> d_name, strlen (mydirent- > d_name), bk_attachments [i], strlen (bk_attachments [i])); 
       } 
     } 
   }