What is the best way to send legal documents by post in the UK?

For most legal documents, Royal Mail Signed For gives you a signature and tracking at a reasonable cost. For anything with a strict deadline or high value - court papers, contracts, deeds - Special Delivery Guaranteed is the safer choice, as it adds a guaranteed delivery time and built-in compensation.

Should legal documents be sent flat or folded?

Important original documents such as deeds, wills or certificates are often better sent flat in a C4 or C5 envelope to avoid crease damage, while standard contracts or letters can usually be folded into a C5 envelope without issue.

Do I need proof of delivery for legal correspondence?

For anything with a legal deadline or where receipt might later be disputed, yes - use a tracked and signed-for service rather than relying on standard post, so you have independent evidence of when the document was delivered.

Can I send original documents like a passport or a will by post?

Yes, but always use Royal Mail Special Delivery Guaranteed for irreplaceable original documents. It provides full tracking, a signature on delivery and compensation cover, which standard services don't offer.

How to Send Legal Documents by Post

Legal documents carry more risk in the post than an ordinary letter: a missed deadline, a lost original, or a dispute over whether something was ever received can have real consequences. Here's how to send contracts, notices, court papers and other legal correspondence properly.

Legal correspondence with someone in prison

Privileged prison mail follows its own Rule 39 and confidential-access procedures. Read the legal-mail section of our guide to writing to a prisoner in the UK and confirm the official requirements before sending. Standard online letter posting does not provide the legal-mail barcode or double-envelope process.

Choose the right Royal Mail service

Not every legal document needs the most expensive service, but most benefit from more than a plain stamp:

Signed For: a good default for most legal correspondence - adds a signature and tracking to First or Second Class at a moderate cost.
Tracked 24 / Tracked 48: useful when you want online tracking but a signature isn't essential.
Special Delivery Guaranteed: the right choice for court deadlines, original documents, wills, deeds and anything high-value - it's the only service with a genuine delivery guarantee and built-in compensation.

Protect the physical document

Original documents that shouldn't be creased - deeds, wills, certificates, signed contracts intended to be kept flat - are best sent in a C4 or C5 envelope without folding, rather than a standard folded DL or C5 letter. For anything genuinely irreplaceable, consider sending a certified copy and keeping the original safe, if the recipient will accept a copy.

Notices with legal notice periods

A Section 8 notice or a letter before action can have specific notice or response requirements. A letter before action normally goes to the intended defendant, not the court. Check the applicable rules, required form and permitted service method. Our historical Section 21 guidance explains why that route must not be treated as a current notice option in England.

Responding to correspondence from a solicitor or court

If you're replying to a letter before action, a court claim form, or correspondence from a solicitor, treat the deadline stated in that letter as firm. Post your response with enough time to arrive before the deadline (not just be posted by it, unless the letter specifically says "postmarked by"), and keep proof of postage or, better, a tracked service so you have independent evidence of when it was sent.

Sending to a court

Courts (HMCTS) generally accept post at a specific address for your case, printed on your court paperwork. Use a tracked service for anything with a hearing date or filing deadline attached, and keep a copy of everything you send - courts do not always confirm receipt promptly, and a tracked delivery record protects you if there's ever a dispute about whether or when documents arrived.

Sending legal documents online without a printer

You can type or upload legal correspondence here at Send Letters Online, choose Signed For or Special Delivery, and we print, fold (or send flat for longer documents) and post it the same working day - useful when you need a tracked, dated delivery record without printing, folding or queuing yourself.

Send legal correspondence with proof of delivery

Choose Signed For or Special Delivery so you have a dated, signed record of receipt. From £2.99, same-day despatch before 2:30pm UK time on working days.

Send with Special Delivery