Sorry, no online dictionaries contain the exact phrase authentic letter.
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Reverse dictionary results:
1. document
 2. authenticate
3. canon
4. criticism
5. fictitious
6. hoax
7. honest
8. legitimate
9. official
10. original
 11. proces verbal
12. real
13. realistic
14. record
15. recorded
16. testament
17. classic
18. fake
19. true
20. use
 21. address
22. addressing
23. air
24. arabic
25. autograph
26. autographed
27. back
28. bak
29. bill
30. book
 31. books
32. brevet
33. brief
34. bull
35. bulletin
36. cachet
37. censor
38. character
39. charter
40. clause

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You can look up the words in the phrase individually using these links:   authentic ?   letter ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
auth*to search for words beginning with auth, or
*tterto search for words ending with tter
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