I am delighted as you are telling me a good news.
I am delighted by the good news.(Here i am not meniton anyone).
Are these sentences correct? Can "as" and "by" use in the context?
kumenglish I am delighted as you are telling me a good news. Unnatural. (Here I am not mentioning anyone).
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kumenglishI am delighted as you are telling me a good news.
Unnatural.
kumenglishI am delighted by the good news.(Here I am not mentioning anyone).
That is good, natural English. You mention the person in context:
Thank you for telling