Flarum is a forum with a neat UI – offers simplicity, ease of usage and extensibility. Does it run in a shared-hosting site with CPanel and no SSH access? Yes. Here are the steps to set it up.
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Symptoms of the Problem: (1) Able to receive emails from Gmail, but unable to send emails to Gmail. (2) Sending email to other emails like *.icloud.com works. (3) Gmail Mailer Daemon respond an error like this: