Registered Mail Code 688: Who Sends It and What to Do (A Guide)

Published on Dec 01, 2025
Updated on Dec 01, 2025
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Close-up of a delivery notice for registered mail with identification code 688, held in a person's hand.

Finding a delivery notice in your mailbox can cause some apprehension. That small white slip, left by the mail carrier, is the gateway to an important communication whose contents you are currently unaware of. However, a key detail can help: the registered mail code. In this comprehensive guide, we will analyze registered mail code 688 in detail, exploring its meaning, possible senders, and the steps to take. Understanding these elements is essential to handling the situation with the right preparation and without unnecessary alarm.

The registered mail code system was designed to categorize communications and provide an initial, albeit general, indication of their nature. Each code, a 12-digit numerical sequence on the notice, has its own specifics. The first three digits are what matter for an initial interpretation. In our case, code 688 belongs to the “raccomandata market” category, a service used by public bodies and companies to send formal communications. Although it’s impossible to be absolutely certain of the contents before collection, code 688 significantly narrows down the possibilities.

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What It Means to Receive Registered Mail with Code 688

Registered mail code 688 generally indicates a communication that is not urgent or judicial in nature. This is a first, important point of reassurance: it is highly unlikely to be a fine, a legal document, or an immediately enforceable tax bill. Instead, this code is often associated with administrative, informational, or commercial communications. It could be a payment reminder, but also a service notification or even good news, like a tax refund.

The communications identified by code 688 are varied. They often concern payment reminders for unpaid utility bills (electricity, gas, water) or telephone services. Other times, they may be sent by banks or financial institutions for matters related to checking accounts, payment cards, or loans. Insurance companies also use this code for communications related to policies or claims management. It is important to note that, although these are often reminders, the tone is not usually one of an imminent legal threat, but rather a formal notice.

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Possible Senders of a 688 Registered Mail

Pinpointing the exact sender of a 688 registered mail before collecting it is nearly impossible, but we can outline a list of the entities that most frequently use this code. Among the most common senders are:

  • Banks and financial institutions: for sending new credit or debit cards, communications about loans, or simple contractual information.
  • Insurance companies: for policy expiration notices, management of traffic accident claims, or other administrative communications.
  • Utility companies: such as electricity, gas, water, and telephone, which send reminders for unpaid bills.
  • Public agencies: the Italian Revenue Agency (Agenzia delle Entrate) may use code 688 for non-enforceable communications, such as courtesy notices or document requests, and sometimes even for IRPEF (personal income tax) refunds. The INPS (National Social Security Institute) may also send notifications related to pensions or bonuses.
  • Other companies or private individuals: sometimes, even lawyers or private citizens may use this service for formal communications.

It’s useful to note how the range of senders is broad and diverse, spanning from the private to the public sector. This variety confirms that code 688 is a versatile communication tool, not tied to a single type of message. For a clearer picture, you can compare it with other codes, such as registered mail code 668, often linked to legal documents, or registered mail code 685, which also relates to various types of reminders.

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What to Do After Receiving the Delivery Notice

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Once you find the delivery notice with code 688, the first rule is not to panic. The most important thing to do is go to the post office indicated on the notice to collect the communication. Ignoring the registered mail is never a solution. In fact, by law, after 30 days of storage at the post office, the notification is considered completed through “compiuta giacenza” (completion of storage). This means that, for legal purposes, it is as if the recipient has received and read the communication, with all the ensuing consequences.

To collect it, you must go to the counter with a valid ID and the delivery notice itself. You can also authorize another person to collect it. In this case, the authorized person must present their own ID, the notice, a written and signed authorization from the recipient, and a copy of the recipient’s ID. Once you have the envelope, it is crucial to read its contents carefully to understand the request or information and act accordingly within the specified times and methods.

The Tradition of Registered Mail in the Digital Age

In a world increasingly dominated by digital communication, registered mail maintains a crucial role, especially in the Italian and Mediterranean context, where the epistolary tradition has deep roots. Registered mail represents a bridge between the tradition of written paper and the need for legal certainty typical of innovation. Its legal value, given by the proof of sending and receipt, makes it an irreplaceable tool for formal communications, combining the reliability of the past with the needs of the present.

This tool is part of a culture that, while embracing digital innovation (like Certified Electronic Mail – PEC), still recognizes the tangible value and solemnity of an official paper communication. The act of receiving a notice, going to the post office, and signing for collection, for example at a post office in Rimini, is part of a ritual that gives weight and importance to the message inside. It is a demonstration of how tradition and innovation can coexist, ensuring effectiveness and security in daily interactions between citizens, companies, and public agencies.

In Brief (TL;DR)

Registered mail code 688 identifies important communications, often related to bureaucratic, tax, or legal matters: discover the most common senders and how to handle the situation with our complete guide.

In this guide, you’ll discover the possible senders of this code, such as the Italian Revenue Agency, INPS, or banks, and how to act to manage the communication without stress.

Finally, we will guide you step-by-step on how to proceed, from preliminary checks to the actions to take after collection.

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Conclusions

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In conclusion, registered mail code 688 should not cause excessive worry. Although it is often linked to payment reminders or administrative communications, it is essential to remember that, in most cases, it does not herald legal documents or fines. The key is to act promptly and consciously: carefully check the delivery notice, collect the letter from the indicated post office, and read its contents carefully. Only then will it be possible to understand the nature of the communication and take the most appropriate actions. Knowing the meaning of registered mail codes transforms a moment of uncertainty into an opportunity to proactively and knowledgeably manage your administrative and financial commitments.

Frequently Asked Questions

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What exactly does registered mail code 688 mean?

Registered mail code 688 identifies a “raccomandata market.” This is a communication that, in the recipient’s absence, is held at the post office for collection. The first three digits of the code, 688, help narrow down the type of sender and the possible content of the letter, which often concerns administrative or commercial communications.

Who are the most common senders of registered mail with code 688?

The senders of a 688 registered mail are varied. Among the most frequent are public agencies like the Italian Revenue Agency (Agenzia delle Entrate) or INPS, as well as private entities. For example, it could be a communication regarding a tax refund, pension matters, payment reminders for utilities (electricity, gas), the sending of a new credit/debit card from a bank, or communications from insurance companies.

Does a 688 registered mail always contain bad news like fines or tax bills?

No, not necessarily. Although it is often associated with payment reminders or communications requiring attention, a 688 registered mail does not always contain bad news. For example, it could announce an IRPEF (personal income tax) refund from the Italian Revenue Agency, the delivery of a new payment card, or other service communications from your bank. Generally, it is not used for traffic fines or urgent legal documents.

What should I do when I find a delivery notice with code 688?

If you find a delivery notice, you must go to the post office indicated on the notice to collect the letter. Remember to bring a valid ID and the delivery notice left by the mail carrier. The registered mail will be held for 30 days, after which it will be returned to the sender.

What happens if I decide not to collect a registered mail with code 688?

Ignoring or not collecting a registered mail is a mistake you should not make. After the 30-day holding period at the post office, the notification is legally considered completed through “compiuta giacenza” (completion of storage). This means that, by law, it is as if you have received and read the communication, with all the legal consequences that follow, even if you do not actually know its contents.

Francesco Zinghinì

Electronic Engineer expert in Fintech systems. Founder of MutuiperlaCasa.com and developer of CRM systems for credit management. On TuttoSemplice, he applies his technical experience to analyze financial markets, mortgages, and insurance, helping users find optimal solutions with mathematical transparency.

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