Setup custom domain mail (Yandex Mail for Domain)

For email communication and marketing purpose, I had setup a custom domain mail with Yandex Mail for Domain (including spf & dkim). I used to be GSuite and Zoho user. Yandex won me over for free unlimited email accounts and accessible in China. My email is kaichew(at)sensq(dot)com and official support email is support(at)sensq(dot)com.