You can just add the MX Records as normal, as well as any other records (spf, dkim, dmarc, etc).
Email Routing/Email Forwarding is an optional service Cloudflare offers that you can use if you want, but you certainly don’t need to.
I see your domain currently has a valid MX Record thaigood4u.com. 300 IN MX 10 _dc-mx.68ee741b438c.thaigood4u.com.
_dc-mx.68ee741b438c.thaigood4u.com. 300 IN A 162.0.216.162 SPF: thaigood4u.com. 300 IN TXT “v=spf1 a mx”
Are you having a specific issue, receiving or sending email?
I wouldn’t use valid to describe an MX that starts with:
That is a telltale sign of an MX that is pointed at a proxied hostname. RFC 5321 4.1.2 prohibits use of the underscore character in MX hostnames. It is preferable to use a dedicated hostname such as mail.example.com and set it to DNS Only.
Ah interesting, my bad, I hadn’t ran into that before.
I’m guessing that RFC is another one that is ignored, just for fun I tested sending to a proxied address like that from gmail and it still worked.
I would for sure clean that up/make an unproxied hostname like he’s suggesting. It does look like 162.0.216.162 is the right IP though, matches the one you shared & has smtp open. Any other info would be helpful.