Hi @geraldmorales,
Wishlist creates an URL encoded to can be compatible with most mail clients. Somes needs the “+” character and not works correctly with spaces. Anyway, you can remove this process. You only need to go to:
yith-woocommerce-wishlist/templates/share.php:44 file
<a class="email" href="mailto:?subject=<?php echo urlencode( apply_filters( 'yith_wcwl_email_share_subject', $share_link_title ) )?>&body=<?php echo apply_filters( 'yith_wcwl_email_share_body', urlencode( $share_link_url ) ) ?>&title=<?php echo $share_link_title ?>" title="<?php _e( 'Email', 'yith-woocommerce-wishlist' ) ?>">
And remove the url encode method from subject, like this:
<a class="email" href="mailto:?subject=<?php echo apply_filters( 'yith_wcwl_email_share_subject', $share_link_title ) ?>&body=<?php echo apply_filters( 'yith_wcwl_email_share_body', urlencode( $share_link_url ) ) ?>&title=<?php echo $share_link_title ?>" title="<?php _e( 'Email', 'yith-woocommerce-wishlist' ) ?>">
Whit this you can generate a mailto URL without “+” character on subject. But be careful, this could not works for some mail clients.