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Forum subscribers no longer receiving emails about new posts

This just started happening  in the last couple of weeks. Nobody is receiving emails about new posts. It had been working fine for several years. I haven’t changed anything in the forum setup so am at a loss th understand where I should look to correct problem. Our site is now running the ,attest version of WordPress not sure but problem may have occurred after the upgrade

The error I see in the mail log is smtp authentication error…….I do have a valid email address in the “sender email address” box but am now wondering if a password for it is required and if so where do I configure the sender email address