Can I open someone else's post?
Generally no — intentionally opening post that isn't yours is a criminal offence. The basis is section 84 of the Postal Services Act 2000. It's an offence, without reasonable excuse, to intentionally open or delay a postal packet while it's in the post (s.84(1)); and it's also an offence to open a packet you know or suspect was delivered to the wrong address, intending to cause detriment (s.84(3)). Once an item is delivered to your household it's generally no longer "in transmission," so s.84(1) stops applying — but s.84(3) still covers wrongly delivered mail, so "it's already been delivered" is not a blanket defence. Living in the same household gives no right to open another person's letters. Opening mail to take the contents is far more serious (theft/fraud). In short: don't open it — return it.
📋 The rules
- Don't open in-transit mail that isn't yours (s.84(1))
- Wrong-address/former-occupant mail: do not open (s.84(3))
- Mark it 'not known here / return to sender' and re-post
- Sharing a household gives no right to open others' post
- Opening to take contents = theft or fraud (far worse)
🔓 Exceptions
- Consent/authority: power of attorney, appointee, 'The Occupier' mail
- Genuine mistake with no intent to harm is generally not an offence (reseal, return)
- A deceased person's executor may lawfully deal with their mail
⚠️ Penalties & fines
For an ordinary person, opening another's mail under s.84 is a summary offence carrying a fine and/or up to 6 months' imprisonment; for offences since 12 March 2015 the fine is unlimited (previously capped at £5,000). A postal worker (s.83) faces a higher standard — up to an unlimited fine and 2 years' prison. If you open mail to steal the contents, that's theft, punishable by up to 7 years. Beware a myth: "post for the previous tenant came to my house, so I can open or bin it" is false — opening can breach s.84(3), and destroying or hiding it can also be unlawful. The same goes for housemates: shared accommodation creates no right to open each other's letters. To handle stray mail: don't open it, write "return to sender" or "not known at this address," and put it back in a postbox.
📎 Official sources
❓ Frequently asked
Is it illegal to open someone else's post?
Generally, yes it's an offence. Under section 84 of the Postal Services Act 2000, it's a crime to intentionally open or delay mail that's still in the post, and also to open a packet you know or suspect was wrongly delivered, intending detriment. The safe course is never to open post that isn't addressed to you.
What if the mail is for the previous tenant?
You still shouldn't open it. Opening a wrongly delivered item can breach section 84(3), and destroying or hiding it can also be unlawful. Instead, write 'not known at this address' or 'return to sender' on the unopened envelope and put it back in a postbox so it can be returned.
Can I open my partner's or housemate's post?
Not without their consent. Living in the same household, or being in a relationship, doesn't give you a legal right to open another adult's mail. Doing so intentionally can be an offence. If you need to deal with someone's post for them, get their permission or appropriate legal authority first.
What if I open something by mistake?
Opening mail genuinely by mistake, without any intention to cause harm, is generally not an offence. The key is what you do next: reseal it as best you can, mark it as wrongly delivered and return it, and don't read, use or keep the contents. Acting honestly on realising the error matters.
Can I open the post of someone who has died?
The person legally entitled to administer the estate, usually the executor or administrator, can lawfully deal with a deceased person's mail. Other relatives should be cautious about opening it without that authority. You can also arrange a special bereavement redirection or stop service through Royal Mail.
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