A flexible national post delivery service for businesses sending unsorted mail

Outsource your business post and access flexible collection times with PremierSort Flex from Whistl

Outsource your unsorted machineable mail and benefit from efficient, ultra-fast sortation and potential cost-savings with our PremierSort Flex service.

Save your business time and hassle by sending a wide variety of letter shapes and sizes without pre-sorting. PremierSort Flex is our most flexible letter and large letter service providing businesses with efficiency and ease of use.

A quick and easy solution for businesses who don’t want the hassle of organising a pre-sorted solution or don’t meet the minimum volume requirement to use our pre-sorted service. You simply decide upon a collection time that best suits your needs and we will collect, sort and distribute your letters and large letters over either 2 or 3 days, depending upon geographical restrictions.


How you benefit

  • Cost effective pricing with more unsorted mail processed per hour
  • Fast state-of-the-art sorting systems
  • Flexible – we can sort a wide range of envelopes including DL/C5/C4 envelopes either blank
    or pre-printed
  • Convenient collection times to suit you
  • Save time and the hassle of franking mail, as we will spray on an indicia/return address


Sorted Business Mail


  • Must be sending a minimum of 250 items per collection
  • Don’t meet the pre-sorted minimum volumes (4,000 items per collection)
  • Can be used for both Direct Marketing and Transactional mail
  • To benefit from the discounts through this service, the mail must be machineable and meet a minimum of 95% read rate
Unsorted Mail Services

We're here to help!

Whether you’re new to Whistl, one of our customers or just want to ask some questions we’d love to chat!
01628 702 965
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