The USPS is apologizing to a group of its customers in Highlands Ranch after a postal carrier left fliers in homeowner's mailboxes, asking for them to artificially increase their mail volume so she could earn higher compensation.

According to the United States Postal Service, the flier was distributed to homeowners living along "Route 16" in the Highlands Ranch Golf Course community, which is classified as a rural route.

A spokesperson for the USPS told 9NEWS that postal carriers assigned to rural routes are evaluated on a scheduled basis to assess route volume, distance, and other factors to determine workload and the level of compensation.

In the flier distributed this week, the postal worker wrote in part:

"During the period of March 12- March 25, 2016, I would really appreciate your help.

The USPS "counts" every piece of mail, parcels, etc. that I handle. The purpose of this 2- week sampling is to set my pay, paid time off, etc. for the ensuing year.

So please mail, mail, order, order, click and ship all you can..."

In the flier, the postal worker goes on to write: "increasing my workload during this "sampling period" might actually get me a paid-day off... What a concept!"

View post on imgur.com

In response to the carrier's letter, the USPS released this statement:

"The carrier’s note was not endorsed by the Postal Service and is against policy that prohibits solicitation of the public. We apologize to the customers who received it and assure them that appropriate action will be taken."

A spokesperson for USPS in the Denver area said they are unaware of any other cases of mail carriers soliciting residents.

The spokesman also said taxpayer dollars are not used for compensation since the postal service is not taxpayer funded.