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Have you recently received a letter from PO Box 4923 in Swindon SN4 8QF and found yourself wondering who it’s from and whether it’s genuine? You’re not alone.
Thousands of UK residents have asked the same question, especially after receiving unexpected communication from this specific mailing address. In a world of increasing postal scams and marketing messages, it’s completely reasonable to want clarity on who is behind this PO Box and why they’re contacting you.
This article will explore the full breakdown of PO Box 4923 Swindon SN4 8QF, uncover who uses it, the reasons for communication, and whether you should be concerned.
We’ll also guide you through how to get in touch and what to do if you feel uncertain. If you’re based in the UK and have seen this address before, this comprehensive guide is written just for you.
What Is the Purpose of PO Box 4923 in Swindon SN4 8QF?
PO Box 4923 in Swindon SN4 8QF functions as an official mailing address designed to support efficient written communication. Its primary purpose is to manage the secure flow of postal correspondence between customers and the company that operates it.
A PO Box ensures mail is directed to a centralised and organised location rather than a traditional office or high-street branch, reducing the risks of delays, lost documents, or breaches in confidentiality.
This particular address is used for handling a wide range of physical communications such as privacy-related notices, service updates, document submissions, and responses to account queries.
It supports structured mail management and is especially useful for sorting incoming documents into relevant processing departments.
The use of a PO Box provides an added layer of postal security and confidentiality, particularly important when dealing with financial or personal information.
Although it isn’t a customer-facing location for in-person visits, PO Box 4923 remains a reliable and formal channel for securely exchanging information via post.
Who Uses PO Box 4923 Swindon SN4 8QF?

PO Box 4923 in Swindon SN4 8QF is used by Capital One (Europe) plc, one of the UK’s leading credit card providers. It is part of their broader contact infrastructure.
This PO Box address handles:
- Written customer enquiries
- Privacy and regulatory correspondence
- Complaints or disputes
- Notifications about accounts or updates
While Capital One is the primary user, on rare occasions, third-party service providers handling services for Capital One may also reference this address. These may include data processors, communication service providers, or outsourced customer service representatives.
In some instances, EQi (a former share-dealing platform) has also been associated with nearby PO Box addresses for certain investment-related matters. However, any legitimate letter from PO Box 4923 will be clearly marked with the sender’s identity, such as Capital One’s name and customer service contact details.
This makes PO Box 4923 an official and operational part of Capital One’s communication chain rather than a random or generic return address.
Why Are You Receiving Mail from PO Box 4923?
If you’ve received a letter from PO Box 4923 in Swindon, it’s likely because you’ve interacted with Capital One UK in some capacity. This could involve current or past credit card ownership, payment history, a previous application, or a customer service engagement.
The company uses this PO Box to issue letters related to your account, financial updates, or ongoing service communications. Mail from this address might include notices about policy changes, interest rates, or reminders about missed payments.
It may also be used for marketing messages if you’ve opted into their communications. Alternatively, you may be receiving a letter due to a former occupant of your address having been a Capital One customer.
Sometimes, it could involve a response to a query or complaint you submitted earlier. In most cases, the letter will specify your name and relevant account or reference details, confirming the legitimacy. If the content feels unrelated to you, it’s best to reach out to Capital One to clarify the purpose and ensure it was not sent in error.
Is PO Box 4923 Swindon SN4 8QF Legitimate?

Yes, PO Box 4923 in Swindon SN4 8QF is a legitimate and verified mailing address for Capital One (Europe) plc, a well-established financial services company authorised and regulated in the UK.
It is widely referenced across official Capital One documentation and is used for handling written communications from customers and service users.
The address is not associated with any known postal scams or phishing attempts as long as the correspondence is genuinely from Capital One.
Authentic letters from this PO Box will typically carry the Capital One logo, contact details, and often your customer ID or account number. You can cross-reference this by checking Capital One’s official website or contacting their helpline directly.
If you’re still unsure about the letter you received, it’s advisable to contact Capital One using their verified phone numbers or online portal. Avoid replying to the letter without confirming its authenticity, especially if it asks for sensitive details. Legitimate use of this address revolves around compliance, transparency, and customer service.
How Can You Contact Capital One via PO Box 4923?
If you need to reach Capital One (Europe) plc by post, you can do so through their official mailing address. This PO Box is designated for handling account-related correspondence, including privacy requests, service queries, and general written communication.
Mailing Address
Capital One (Europe) plc
PO Box 4923
Swindon
SN4 8QF
United Kingdom
For complaint submissions, a different postal address is in place to route such matters directly to the resolution team.
Complaints Resolution
Capital One (Europe) plc
PO Box 4928
Swindon
SN4 8QF
When writing to either address, make sure to include your name, customer ID, and a clear description of your query to help avoid delays. Below is a quick reference table:
| Query Type | Address or Action |
|---|---|
| General Enquiries | PO Box 4923, Swindon, SN4 8QF |
| Complaints | PO Box 4928, Swindon, SN4 8QF |
| Online Account Help | Visit capitalone.co.uk |
| Customer Services | Call 03444 812 812 |
Keep a copy of all correspondence and post with care to ensure it reaches the intended department securely.
What to Do If You Have Concerns About PO Box 4923?

If you’re unsure about a letter from PO Box 4923 in Swindon, the first step is to examine it carefully. Check for official branding from Capital One, look for your name and customer details, and confirm whether the content aligns with your current or past dealings with the company.
Should anything appear suspicious or if the letter is addressed to someone else, avoid responding or sharing personal information. Instead, contact Capital One using their official helpline or website to verify the letter’s legitimacy.
You can also take a photo of the envelope or document and send it to their support team for quicker clarification.
If the letter seems completely unrelated to you, consider returning it to sender by writing “Not at this address” on the envelope and posting it back.
In rare cases where you suspect fraud or identity misuse, you should report the incident to Action Fraud UK and notify your financial provider for further advice. Always handle such concerns promptly to protect your information.
What Are the Alternatives to Contacting Capital One via Mail?
If you prefer not to use postal mail, Capital One UK offers several modern and efficient ways to get in touch. These include phone support, online account management, secure messaging, and complaint forms. Using these alternatives can be faster and more interactive than traditional post.
Here are some helpful contact options:
| Contact Method | Details | Purpose |
| Online Portal | capitalone.co.uk | Manage accounts and submit queries |
| Customer Service | 03444 812 812 | General support and enquiries |
| Lost Card (UK) | 0800 952 5267 | Report lost or stolen card |
| Fraud Helpline | 0800 952 5458 (account) / 5143 (application) | Report suspicious activity |
| Secure Messaging | Log into your account | Private communication |
If you’re handling time-sensitive issues or want a quicker response, these methods are more efficient than waiting for postal replies. Digital communication also gives you confirmation of delivery and response times, making it easier to track your interactions with the company.
Conclusion
Receiving a letter from PO Box 4923 Swindon SN4 8QF might raise questions, but in most cases, it’s a standard method used by Capital One UK to communicate with customers. Whether it’s about privacy updates, account changes, or complaints, this address serves a functional and secure role in their operations.
By understanding the purpose and legitimacy of this address, you can better manage your interactions and stay informed about your account. If in doubt, always use the verified contact methods provided by Capital One to confirm any correspondence. The key is to stay cautious yet informed.
Knowing your rights and having access to the right contact channels helps you protect your personal information while resolving any concerns confidently. This guide gives you the clarity you need on PO Box 4923.
FAQs
What kind of mail does Capital One send from PO Box 4923?
They send account updates, legal notices, and customer service letters. These may include privacy statements or responses to complaints.
Can I send personal documents to PO Box 4923 safely?
Yes, it is a secure address managed by Capital One. Always include your name and account number for quicker processing.
How do I confirm a letter from PO Box 4923 is real?
You can call Capital One’s official helpline or visit their website. They will confirm if they sent the letter.
Is PO Box 4923 linked to any fraud cases in the UK?
There are no reported fraud cases directly tied to this PO Box. Always verify content before taking action.
How long does it take to receive a reply from PO Box 4923?
Replies typically arrive within 7 to 10 business days. Complex issues may take longer depending on the investigation.
Are there other addresses used by Capital One UK?
Yes, such as PO Box 4928 for complaints. Always check the sender’s contact info on official correspondence.
What should I do if I get someone else’s mail from PO Box 4923?
Mark it as Not at this address and return it to the postbox. Do not open mail that isn’t addressed to you.