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Our customer service is currently congested. If your case concerns the prevailing coronavirus situation, you will find answers to frequently asked questions here.

Impressive communication with domestic letter services

A letter is a flexible and inexpensive solution for individual and effective communications as well as for tasks such as invoicing.

Who is the service designed for?

Posti’s letter services are suitable for businesses of all kinds and all sizes. We will ensure the delivery of letters to over 15,000 Posti P.O. Box or Corporate Postal Code addresses specified by the company itself. Letter payment and mailing methods are selected based on the number of items.


If the address is incorrect or outdated, we will carry out address clarification and deliver it to the recipient’s valid mail address without extra charge. If we are unable to determine the correct address, we will return the letter to you.

Sending a letter is an excellent way to draw attention and ensures that you will reach your customer reliably. Posti’s letter delivery services always include address clarification and guarantee secrecy of correspondence.

If you want your letter to be delivered quickly, you can choose to mail it as a Priority Letter, which will reach the recipient within two weekdays from the mailing date. For less urgent items, we recommend choosing the inexpensive Economy Letter, which will be delivered within four weekdays from the mailing date. The Express letter provides item tracking and brings security to the schedule, in large cities also delivery on Saturdays.

  • Messages are delivered reliably.

  • You can choose the delivery time that suits your needs.

  • Address clarification without extra cost.

A domestic business letter have two delivery speeds, Priority or Economy. Economy Letters will usually be delivered to the recipient within four weekdays from the mailing date. Priority Letters normally reach the recipient within two weekdays from the mailing date.

For contract customersEconomy Letter

Affordable and reliable. For personal and effective communications, 4 working days.

For contract customersPriority Letter

High-quality and prompt. For personal and effective communications, 2 working days.

A Standard Letter is suitable for sending standard-sized and machine-readable messages, such as invoices. Standard Letters are delivered with the speed of the service you selected. In addition to optical reading requirements, suitability for machine handling also sets certain dimension, shape, material, color and content requirements for the letter.

Are you sending more than one million letters in a year? Read more about advantages.

For contract customersStandard letter

Suitable for machine sorting, Standard letter is the most affordable way of sending large quantities of letters that travel at the speed of your selected service

Express letter brings security to the schedule and provides item tracking. The letter is generally delivered the following weekday from the mailing. In large cities also delivery on Saturdays.

For contract customersExpress Letter

Letters are delivered within 1–2 working days of mailing, also on Saturdays upon request (not on public holidays).

Find the best sending services for your company’s needs

Send without a contract

For sending parcels fast and occasionally

  • When you send fewer than 20 parcels a month
  • Fixed price per parcel, pay online immediately
Send with a contract

For sending parcels and freight regularly

  • When you send more than 20 parcels a month
  • For sending freight regularly
  • Pricing is based on the number of the items, payment with an invoice