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by the137 2065 days ago
'an' is used when the sound of the next letter is the sound of a vowel, so in the case of eN-E-S, 'an' is correct.

In english multiple vowels in a row cause you to take a pause, which is why the -n is added

Worth noting, the other posters are correct in saying that 'a snezz' or 'a ness' is also correct.