from experience, locally poslaju would be the best / cheapest option.
having so many offices makes it easily available thruout malaysia.
so far no problems.

dhl / ups / fedex are international couriers that work better shipping overseas. they charge more obviously but is secure + safe + faster.

poslaju does offer overseas postage, but it's quite expensive almost 200 i believe when i tried to send a jersey back to the UK.
better use UPS like that