> While the Postgres community has an older and sometimes daunting contribution process of submitting patches to a mailing list, [...]
The Linux kernel works the same way.
What are other big open source projects using if they are not using mailing lists?
I could imagine some using GitHub but IME it's way less efficient than mailing list. (If I were a regular contributor to a big project using GitHub, me being me, I would probably look for or write myself a GitHub to e-mail gateway).
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