Wildcard MX & SPF records

I wanted to know if Cloudflare supports wildcard MX & SPF records, for e.g.

MX | * | mx.some-email-server.com | 10 | Auto | DNS Only
TXT | * | v=spf1 a mx include:spf.some-email-server.com -all | Auto | DNS Only

If yes, then are there any disadvantages of using wildcard MX & SPF records?

Thanks in advance.

It seems to:

But I’d run some tests with DNSChecker.org to see what results one gets for the various hostnames you expect to be covered by the wildcard.

The disadvantage would be SPAM to random subdomains hitting the mail server.

@sdayman

Thank you, I get it now.

Yes, you are right about the wildcard MX, I didn’t realize that wildcard MX could be an open gateway for the spammers.

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