Sending email from SendGrid SMTP, but got timeout error 524

Trying to send test outgoing mail from Moodle via SendGrid SMTP, but got timeout error 524

The server is working well seelearningtaiwan(dot)org
Domain Authentication is verified.
There is an alert asking to Add an MX record for your root domain, but SendGrid said that they already provided CNAME, MX record is not needed.

Any suggestion where should I look into…
Thanks

Finally got it working, and the problem was that I did not put the No-reply address correctly.

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