1. Does a notification letter without a seal have legal effect? ??If the notification letter is issued by a natural person, it only needs to be signed by the natural person and no seal is required. If it is issued by a legal person or other organization, it needs to be stamped with an official seal to be valid. Article 490 of the "People's Republic of China" and the Civil Code of the People's Republic of China: If the parties conclude a contract in the form of a contract at the time of establishment of the contract, the contract shall be established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established. Article 565: If one party to the contract termination procedure claims to terminate the contract in accordance with the law, he shall notify the other party. The contract is terminated when the notice reaches the other party; if the notice states that the debtor does not perform the debt within a certain period, the contract will be automatically terminated. If the debtor fails to perform the debt within the period, the contract will be terminated when the period specified in the notice expires. If the other party has objections to the termination of the contract, either party may request the people's court or arbitration institution to confirm the effectiveness of the termination. If one party directly claims to terminate the contract by filing a lawsuit or applying for arbitration without notifying the other party, and the people's court or arbitration institution confirms the claim, the contract will be terminated when a copy of the complaint or arbitration application is served to the other party.

2. What are the precautions for writing notification letters? 1. Pay attention to the difference between a letter of approval and a request for instructions. When requesting instructions and approval matters from a superior authority with a subordinate relationship, use a request for instructions, while requesting instructions from a business supervisor without a subordinate relationship. When the agency requests approval of relevant matters, a letter of approval is used. The competent authority responds to requests for approval with an approval letter. 2. Get straight to the point and get to the point. Regardless of whether you are sending a letter or replying to a letter, do not beat around the bush, and avoid empty words, clichés, and general comments. 3. One article and one letter, concise and clear. 4. The language must be standardized and appropriate, and reflect the language characteristics of the letter. When sending letters, you must use calm, polite, and sincere language, be respectful and humble to the competent authorities, be gentle to lower-level units, and be friendly to parallel units and units that are not affiliated with them. Avoid using harsh, commanding language. When replying to a letter, your attitude should be clear, your language should be precise, and avoid vagueness, generality, and hesitation. Through the above analysis, we know that according to the provisions of the Civil Code, whether the notification letter needs to be stamped depends on who issued the notification letter. If it is issued by a natural person, only a signature is required without a seal. If it is issued by a legal person, it needs to be stamped with the official seal of the legal person.