I added a clients website to cloudflare today, Pro account so updated name servers.
His website is hosted with Siteground and the emails are on a different server.
All I did was change the A record to point to siteground and left all the other DNS setting and now no emails are being recieved.
Strangely enough they seem to be showing in the spam filter on the email host. But are not being delivered to email client.
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