Someday, one of you may have to temporary leave Singapore and living abroad. You are leaving behind all administratives correspondent with government agencies such as CPF, HDB, IRAS etc. They may send you notification letter, information to mailbox in your precint. And yes, on their records you have received the mail but actually you never read those mails because you’re not at home.
OneInbox (https://www.oneinbox.gov.sg) could be the solution for you. It is free platform to receive government mail and keep it for 18 months before deletion. Just imagine that you will dispose hardcopy mail after sometimes. If you want to keep the correspondent for lifetime, you can forward it to any email address at your choice.
To start using OneInbox, login to https://www.oneinbox.gov.sg using SINGPASS; agree to term and conndition, complete/update personal information and subscribe to the available agencies.