Picky mail systems won't accept email addresses where recipient has period
in name; ie.  David S.  Miller <davemloft.net> will not work.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
     $name =~ s/^\"|\"$//g;
     $address =~ s/^\s+|\s+$//g;
 
-    if ($name =~ /[^a-z0-9 \.\-]/i) {    ##has "must quote" chars
+    if ($name =~ /[^\w \-]/i) {         ##has "must quote" chars
        $name =~ s/(?<!\\)"/\\"/g;       ##escape quotes
        $name = "\"$name\"";
     }
     $name =~ s/^\"|\"$//g;
     $address =~ s/^\s+|\s+$//g;
 
-    if ($name =~ /[^a-z0-9 \.\-]/i) {    ##has "must quote" chars
+    if ($name =~ /[^\w \-]/i) {          ##has "must quote" chars
        $name =~ s/(?<!\\)"/\\"/g;       ##escape quotes
        $name = "\"$name\"";
     }