Recently some of my emails (using G Suite) are ending up in junk/spam folders. I checked the email with mail-tester.com and it looks like one of CloudFlares IP addresses is in a blocklist as I am seeing the error below.
Error: Contains an URL listed in the SBL blocklist
Regarding Cloudflare and e-mail, all DNS hostnames for e-mail (usually people have an A mail record at DNS tab on Cloudflare dashboard for their domain, which is being pointed to an IP address, or use external e-mail services like G Suite and other) should be (DNS-only) for propper function.
Cloudflare’s default configuration only allows proxying of HTTP traffic and will break mail traffic.
More information here:
Therefore, Cloudflare by default does not proxy e-mail traffic, only web.
In case your e-mails aren’t working, you can also check here:
Regarding this one issue, there were recent topics here: