Franked mail must be posted on the same date that is printed on the frank, sorted by class and format, and handed over in the way Royal Mail expects. Get any of those three wrong and your mail can be delayed, surcharged or returned to you. This guide explains exactly how to present and post franked mail in 2026, from the date on the impression to the colour of the pouch it travels in.
Why presentation matters more than most mailrooms realise
Franking is a discount for doing part of Royal Mail's job for it. When you frank an item you are declaring the service, the format and the postage paid, which means Royal Mail does not have to price it at the point of collection. That is why Royal Mail's franking service is cheaper than stamps: from 7 April 2026, a First Class letter up to 100g costs £1.77 franked with Mailmark against £1.80 by stamp, and the gap is far wider on large letters.
The flip side is that the discount depends on presenting mail correctly. A bundle that arrives unsorted, undated or wrongly franked has to be handled manually, and Royal Mail is entitled to hold it, surcharge it or send it back. Most of the problems we hear about at Green Franking are not machine faults. They are handover mistakes made in the last five minutes of the working day.
Rule one: the date on the frank must match the date of posting
This is the rule that catches out more businesses than any other. Every franked item must enter Royal Mail's network on the date shown in the impression. Frank a stack of envelopes at 4pm on Friday, leave them in the out tray until Monday, and those items are technically invalid.
The practical convention is a 5pm cut off. Anything franked after your final collection should carry the next working day's date, and most modern meters can roll the date forward automatically. Check that your machine's advance date setting is switched on, because on many models it is not enabled by default.
If you do frank with the wrong date, do not panic and do not bin the envelope. The accepted correction procedure is to strike a single line through the incorrect date in black ink, reset the machine to the correct date and a value of £0.00, then frank again either directly onto the envelope to the left of the original impression or onto a franking label placed alongside it. The zero value frank simply proves the date, it does not pay for anything twice.
What about weekends and bank holidays?
Date your mail for the next day on which Royal Mail will actually collect. If your collection runs weekdays only, a Friday afternoon batch should carry Monday's date. Holding franked mail for several days is a common source of returned items in December and around Easter.
Rule two: sort before you seal the pouch
Royal Mail expects franked mail to arrive already separated. The hierarchy is destination first, then service and class, then format: UK apart from international, First Class apart from Second, letters apart from large letters.
Format matters because the two categories are machined differently. A standard letter is up to 240mm x 165mm x 5mm and 100g, while a large letter goes up to 353mm x 250mm x 25mm and 750g. Our letter or large letter size guide covers the measurements and the surcharges that follow a wrong call.
Once sorted, face all the addresses the same way and keep every frank impression in the same corner. Band each bundle. If you present in trays, the working limits are roughly 340 letters or 80 large letters per tray.
The pouch colour code
Royal Mail issues colour coded pouches so that its staff can identify contents without opening anything:
- Red pouch for First Class UK mail
- Green pouch for Second Class UK mail
- White pouch for international mail
Where you send enough volume to use sacks rather than pouches, sort by class and service, tie the correct First or Second Class neck label to the sack, and keep each sack under 11kg so it can be handled safely.
Rule three: choose the right handover route
There are three ways franked mail enters the network, and only one of them is genuinely suitable for volume.
Scheduled collection. If you post regularly, a booked collection from your premises is the cleanest option. Mail is taken already sorted and the daily cut off is predictable, which makes the date rule much easier to obey.
Drop off at a Royal Mail delivery office or Customer Service Point. Useful for irregular volume. Take your pouches or trays already sorted and hand them over rather than leaving them at a counter.
Post box. Acceptable only for small quantities of franked letters that fit through the aperture without being forced. Never post franked parcels or thick large letters in a post box, and never leave a bundle propped beside one.
Post Office branches are a common point of confusion. Many will not accept franked mail at all, because the items are already paid for and there is no transaction to process. Assume you need a collection or a delivery office unless your branch has confirmed otherwise.
The supplies that quietly decide whether this works
A correct date and a tidy bundle count for nothing if the impression cannot be read. Mailmark franks carry a 2D barcode that is scanned automatically, and a faded print is the fastest route to a rejected item. Using the correct Pitney Bowes ink and labels, Quadient ink and labels or FP Mailing ink and labels for your model is not a detail, it is what makes the barcode scannable.
Envelope choice matters too. A franking machine feeds cleanly through flat, evenly sealed stock, and a poorly gummed flap or an over stuffed envelope will skew the impression. Our self seal envelopes are cut for machine feeding, and we compared the options in self seal or gummed envelopes.
There is an environmental angle too. Every returned item is a second journey through the network for the same letter, which is wasted fuel and wasted paper. Getting presentation right first time sits alongside the measures in our sustainable mailing guide and our cartridge refilling and recycling service.
A five minute end of day checklist
- Confirm the date on the meter matches today, or tomorrow if you have missed the collection.
- Check one impression from each batch for a clean, complete, readable frank.
- Separate UK from international, then First from Second Class, then letters from large letters.
- Face all addresses the same way with franks in the same corner, then band each bundle.
- Load into the correct coloured pouch or tray and keep sacks under 11kg.
- Hand over by collection or delivery office, and keep your posting receipt if one is offered.
None of this takes long once it is habit, and it removes almost every reason for franked mail to come back to you. If the machine itself is the weak link, Mailcoms supplies and services Royal Mail approved franking machines and offers a flexible rental plan. Green Franking keeps the ink, labels and envelopes flowing once it is in place, so contact our team if you are unsure which consumables your model takes.
Frequently asked questions
Can I post franked mail the day after I frank it?
No. Franked mail should be posted on the date printed in the impression. If it has missed the collection, either re-frank it with the next working day's date at a value of £0.00 after striking through the original date, or hold the items and re-frank them the following day.
Can franked mail go in a normal post box?
Small quantities of franked letters can go in a post box provided they fit through the aperture easily. Franked parcels, thick large letters and bulk bundles should go via a booked collection or a Royal Mail delivery office instead.
Do I have to separate First and Second Class franked mail?
Yes. Royal Mail expects franked mail to be separated by destination, then by service and class, then by format. First Class goes in a red pouch, Second Class in a green pouch and international mail in a white pouch.
What happens if my frank is smudged or unreadable?
An unreadable frank, particularly a damaged Mailmark barcode, can cause the item to be surcharged or returned. Replace the ink cartridge at the first sign of fading and run a test impression before starting a large batch.
Will the Post Office accept my franked mail?
Many Post Office branches do not accept franked mail because the postage is already paid and the branch has no transaction to process. Use a booked collection or a Royal Mail delivery office unless your local branch has confirmed it will take it.
Is franking still cheaper than stamps in 2026?
Yes. Under the rates that took effect on 7 April 2026, a First Class letter up to 100g is £1.77 by Mailmark franking against £1.80 by stamp, with larger savings on large letters. Only Mailmark meters remain certified, as non Mailmark machines have been decertified.