Spec. for check_field()?

Hi,

snstore is giving me `append: bad header' errors.  On looking at
check_field() in field.c I see

    int check_field (char *field, int len)
    {
       int i;

       for (i = 0; i < len; i++)
       {
          if (field[i] >= 'a' && field[i] <= 'z')
             continue;
          if (field[i] >= 'A' && field[i] <= 'Z')
             continue;
          if (field[i] >= '0' && field[i] <= '9')
             continue;
          if ('-' == field[i])
             continue;
          if (':' == field[i])
             return (i);
          if (' ' == field[i] || '\t' == field[i])
             break;
          return (0);
       }
       do
          i++;
       while (field[i] == ' ' || field[i] == '\t');
       if (':' != field[i])
          return (0);
       return (i);
    }

That seems to be matching /^[a-zA-Z0-9-]*[ \t]*:/.  What's the RFC or
other spec. for this routine?  It doesn't allow `=' for example, and
would pass ` :' AFAICS.

Shouldn't it be /^[\x21-\x39\x3b-\x7e]+:/, i.e. one or more of any
printable character, except a colon, followed by a colon.  That's from a
quick look at section 3.2 in http://www.faqs.org/rfcs/rfc822.html.

Cheers,


Ralph.

PS. Anyone out there?