Diplomatic correspondence
（重定向自Letter of Recall）
![An 1862 letter of condolence from Abraham Lincoln to Queen Victoria on the occasion of the death of Prince Albert shows the republican salutation](/Images/godic/202501/24/GreatGoodFriend2832.jpg")
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![United States ambassador David Jacobson poses for a photo with Governor General of Canada Michaëlle Jean after presenting his letter of credential during a formal ceremony at Rideau Hall.](/Images/godic/202501/24/Canadian_Governor-General_Michelle_Jean_accepts_US_Ambassador's_credentials2832.jpg")
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Diplomatic correspondence is correspondence between one state and another, usually – though not exclusively – of a formal character. It follows several widely observed customs and style in composition, substance, presentation, and delivery and can generally be categorized into letters and notes.