The phrase "an letter" is not correct in written English.
It should be "a letter" because "letter" begins with a consonant sound.
Example: "I received a letter in the mail today."
Alternatives: "a note" or "a message".
He collapsed after reading an letter of apology to the court that described the men's "folly".
One of the men, Thomas Whitworth, fainted after reading an letter of apology to the court in which he described the incident as a "moment of folly".
Lynn Marie Rink posted an letter of thanks with a picture of her son James and the employee in the hope of tracking him down after she was taken aback by his kindness.
In an letter to the Fish and Wildlife Service, the corps wrote that the proposal was "likely to adversely affect" four threatened species, the gulf sturgeon and three mussel types.
David Bermingham, one of the three former NatWest bankers fighting extradition to the United States, responded to the defense of the Extradition Act by Andy Burnham, Home Office minister, in an letter in The Daily Telegraph last week.
[Section A.] Vivendi's Chief Chastises Doubters In an letter to employees last week, Vivendi Universal's chief executive, Jean-Marie Messier, left, complained that Vivendi's share price was the "victim of suspicions and manipulations," and "had no relation with our performance".
