One of the first things I did when we lined up our move was to change our address with Singpost.
I’ve had to go down and follow up with Singpost twice. The mail isn’t getting forwarded. Which sucks on its own, but especially so because you have to pay for changing your address.
So, if you can, ensure that everyone has your new address, and maybe don’t bother paying Singpost.
I don’t know about other countries, but in the US your mail is forwarded automatically once you fill out a form, it’s free, and it works .