Typically you need to point an MX record at an A record.
Set up an A record for mail.hgoods.site pointing at th IPv4 address required
What do you want your email domain (the bit after the @) to be?
If you want it to be @hgoods.site then you will need to either:
- Leave the field empty
- Or, place a @ symbol in the field
It depends on your DNS hosting provider.
Also that TTL value seems a bit large. I would start with a small TTL until you are happy with the results, then increase the TTL later.
TTL value is in minutes and influences how quickly you can propagate a DNS change across the Internet a TTL of 240 would mean a DNS server would not re-request information for 4 hours.