+ # I'm not sure if address obfuscation and mailto: links can
+ # be made compatible; and address obfuscation is misguided,
+ # anyways.
+ return (\@arg, '', $reply_to_all) if $obfs;
+
+ # keep `@' instead of using `%40' for RFC 6068
+ utf8::encode($to);
+ $to =~ s!([^A-Za-z0-9\-\._~\@])!$URI::Escape::escapes{$1}!ge;
+