Royal Mail is the authoritative source of the UK’s official postal addressing data, best known through its Postcode Address File (PAF).
PAF is the definitive list of deliverable postal addresses in the UK and is the backbone of almost all legitimate UK address validation systems.
What Royal Mail data represents
Royal Mail data defines:
- Official postal addresses
- Valid postcodes and address structures
- Which properties are deliverable by post
- Sub-building details such as flats, units, and apartments
- Status changes (new builds, deletions, changes of use)
This is not about geography or mapping. It is about mail delivery reality.
Why Fetchify uses Royal Mail data
Fetchify uses Royal Mail PAF as the primary authority for UK address validation.
In practical terms, this allows Fetchify to:
- Confirm an address is real and deliverable
Not just plausible or geographically nearby. - Prevent fake or inferred addresses
Addresses are validated against official postal records, not generated from map data. - Handle UK-specific address complexity
Including flats, building names, sub-premises, and postcode-level quirks. - Keep address data up to date
With regular updates reflecting new builds, changes, and removals.
Why this matters to customers
Using Royal Mail-backed validation helps customers:
- Reduce failed deliveries and returns
- Avoid carrier penalties caused by invalid addresses
- Improve checkout success rates
- Keep CRM, billing, and fulfilment data clean
- Meet compliance and operational expectations for UK addresses
If an address is not in Royal Mail data, it is not a valid UK postal address, regardless of whether it appears on a map.
Royal Mail data tells Fetchify whether an address can actually receive post.
Maps show where things might be.
Royal Mail confirms whether something exists for delivery.
Fetchify uses Royal Mail data in