What is the name of the domain?
home-dekor.cz
What is the issue you’re encountering
Hello, we transfered domain home-dekor.cz under your nsservers two days ago, because of DDos attack. With that we changed mail provider and MX records from myshoptet.com do Google workspace. We can send and receive some mails, but we cannot receive any mails send from some domains, such as shoptet.cz vidaxl. Can you please check it if we have some issue in DNS records or somewhere else, which could cause this? Thank you.
Welcome to the Cloudflare Community. 
You have valid MX records from a public perspective. No one in the Cloudflare Community will be able to view the DNS resolution from the sender’s perspective. You need to ask the sender that is having delivery issues to investigate from their side.
What is the name of the domain?
home-dekor.cz
What is the issue you’re encountering
Hi, we have the MX records set up correctly according to Google workspace, but we are not receiving emails. Some emails go through, but some don’t. It’s kind of blocked. Have our MX records been published please? It seems like we are blocking some senders. Thank you for the information
Already answered.
There is nothing that Cloudflare or the Community can do to assist you.
Your other option is to engage your email provider (Google) or, if you purchase that service through a resale partner, contact their support.
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Thank you for your answers. I was trying to solve it for last two days. We needed to enable DNSSEC under Cloudflare, which I successfully did, but I still cannot see any CNAME records which are for our domain (home-dekor.cz) under Cloudflare. Yesterday evening I turned off Proxy of CNAME records (they are now DNS only) and left only A records under Proxy. As much as I could find on community this should help and CNAME records should be resolving to third-party and this should help to verify domain a make it possible to recieve emails. But until now any online CNAME validator cannot see them. I am in the end with ideas to solve it.
https://toolbox.googleapps.com/apps/dig/#CNAME/
The problem seems to be that you’re looking up home-dekor.cz and expecting to find records for all of its subdomains. That’s not how DNS works.
You need to look up the individual subdomains to find the host they resolve to. Eg look up ftp.home-dekor.cz and you’ll find it points to ftp.myshoptet.com.
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