Also copied from the USPS website:

To request door delivery, you need to write a letter requesting this change and attach a statement from a Doctor. The doctor's statement should indicate you are unable to collect your mail from a curb or centralized mailbox. Both your letter and the doctor's statement must be sent to the Post Office™ that delivers your mail for approval or denial. Final determination on whether or not door delivery will be granted will be made by the Post Office.

Request letters should be addressed to:

POSTMASTER UNITED STATES POSTAL SERVICE <YOUR CITY, STATE AND ZIP CODE>

Note: Any approval will be temporary (further information can be obtained from the local Post Office).

-- I read a news story about this, and basically they keep asking you if you still need Door Delivery or if your disability is cured. So it's "temporary" because you have to keep sending them back their query letters, and saying, "Yup, I'm still disabled."

Also copied from the USPS website:

To request door delivery, you need to write a letter requesting this change and attach a statement from a Doctor. The doctor's statement should indicate you are unable to collect your mail from a curb or centralized mailbox. Both your letter and the doctor's statement must be sent to the Post Office™ that delivers your mail for approval or denial. Final determination on whether or not door delivery will be granted will be made by the Post Office.

Request letters should be addressed to:

POSTMASTER UNITED STATES POSTAL SERVICE <YOUR CITY, STATE AND ZIP CODE>

Note: Any approval will be temporary (further information can be obtained from the local Post Office).