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I have PublishPress that uses WP Mail SMTP. I can send a test message to my personal email address yet when I publish a post, a failed notification for this email is created. There are a few email that are failing, they are outlook.com, yahoo.con, aol.com and live.ca all other emails work.
I have forced WP Mail SMTP to use help@humanipro.org which is the same as the website’s email.