We have a small community the men & women sit in the same hall. There is no Maulana present. Is it allowed for women to recite noha/Salam?

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This is an answer from Ayatollah Sistanis site regarding reciting Quran which would also apply here:

If the woman knows that strange men hear her voice, it is Haram to make her voice soft and beautiful to a level that habitually/customarily it is provocative.