Are they both correct? Which sounds more natural to you?
A) I got five letters, but none of them were from my teacher.
B) I got five letters, but there wasn’t a letter from my teacher among them.
They are both natural English. "
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They are both natural English. Sentence A is better in most contexts, but bear in mind that some think "none" is technically singular: "but none of them was from my teacher." Your version is more natural and better because "none" is not really singular: "but none of them were …."