Sorted Business Mail Services
Reduce mail delivery costs and benefit from a day-definite UK-wide delivery with sorted mail services.
Pre-Sorted Mail Solution for Businesses
Pre-sorted mail is organised by postcode or delivery route before being handed over to the postal service. When items are pre-sorted the choosen mail carrier can pass on the cost savings and faster delivery times for your company.
With our sorted mail service, your business can enjoy the much-needed flexibility and convenience of choosing pickup times while saving significantly on mailing costs.
Request a call back for a bespoke quoteHow Does Whistl's Managed Sorted Mail Service Work?
Experience significant savings on business mailing services when you work with Whistl during this process:
- Hand over your pre-sorted letters and large letters to Whistl for more efficient mail deliveries.
- Whistl's team will collect your mailing items at a time that suits you.
- We will then ensure they are processed to Royal Mail's full specification and delivered along Royal Mail's delivery routes.
- As a Premier customer, your business will also benefit from the added security of proof of delivery to Royal Mail.
- Our Premier mailing service lets you choose your pickup and delivery times. When you work with Whistl, you can experience significant savings on business mailing services.
Sorted Mail Service: Key Information
| Category | Machineability | Formats | Service | Destination | Min. volume items | Max. weight |
|---|---|---|---|---|---|---|
| Pre-Sorted | OCR Mailmark Mech Manual | Letters Large Letters | 2-day 3-day | UK | 4000* | Letters 100g Large Letters 750g |
*The minimum volume is based on each collection and will vary depending on the service.
Please contact your account support team to discuss your mailing needs.
Sorted Mail Requirements
- Minimum volume of 4000 to 10,000 items per customer ID, per collection, per day
- Mail must be sorted according to format and weight band
- Every item must carry a Whistl-approved indicia and a valid UK return address
- A minimum of 90% of mailing items must be fully and accurately addressed and postcoded following the Royal Mail's Postcode Address File
Minimum and Maximum Sorted Mail Dimensions
Use the dimension guidelines below to ensure your business complies with the minimum and maximum pre-sorted mail dimensions.


Enhance Your Business with Sorted Mail Delivery Management
If your business sends bulk mail, it could benefit from the slashed postage costs, faster delivery times, and improved reporting and tracking of our sorted mail service. Get in touch with us to streamline your business mailing process today!
Read Some of Our Mail Management Customer Success Stories
Nationwide Partner with Whistl to Drive Cost-Efficient Mail Management
Nationwide Building Society


Imperial College Switch to Whistl For Mail Efficiency
Imperial College Healthcare NHS Trust


Frequently Asked Questions: Whistl's Sorted Mail Service
What is Whistl’s Sorted Mail service?
Whistl's presorted mail solution is an option for businesses, enabling letters and large letters to be pre-organised by postcode or delivery route before being collected, reducing in-house handling and delivery costs for large mailers.
How does the sorted mail managed service work in practice for a large business?
Your team hands over pre-sorted letters and large letters to Whistl, Whistl collects at agreed times, then processes items to full Royal Mail specification and routes them for UK-wide delivery on a 2‑ or 3‑day service.
What types of items can be sent using the sorted mail service?
The service covers machineable and manual letters and large letters, supporting OCR (Optical Character Recognition) and Mailmark formats, with a maximum weight of 100 g for letters and 750 g for large letters.
What are the addressing quality requirements for sorted mail?
At least 90% of items must be fully and accurately addressed and postcoded in line with Royal Mail’s Postcode Address File standards to ensure machine-readability and efficient routing.
Is presorted suitable for ongoing BAU mail as well as campaigns?
The solution is designed for any bulk mail, including statements, bills, policy documents, and marketing campaigns, making it suitable as a single outsourced mailing platform for large enterprises.




