Can I configugure multiple Dmarc?

13 replies
Dear,

I am using cloudflare dns management

I am using few smtp provider, each of them had their own sfp, dkim and dmarc.

I know I can configure multiple SFP, and DKIM in my DNS, but when I try to configure another DMARC, it shows error: An A, AAAA or CNAME record already exists with that host. (Code: 81053)

I found that my hostname _dmarc and value to_dmarc.FirstProvider.com

how can I add in _dmarc.SecondProvider.com ?
#configugure #dmarc #multiple
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  • Are you adding it as a TXT record?
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  • Profile picture of the author calvynlee
    I am adding it as CNAME, instruction given by the smtp service provider
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  • You can't have multiple CNAMEs with identical hosts. That's not how CNAMEs work. Use a different host (subdomain) for the second provider
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  • Profile picture of the author calvynlee
    _dmarc will be the hostname provide by both provider.

    is there any way to combine both value as 1?

    just like spf where it can combine different provider together.
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  • No, CNAME doesn't work like that. DNS is not a load balancer.
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    • Profile picture of the author calvynlee
      Originally Posted by correcthorsebatterystaple View Post

      No, CNAME doesn't work like that. DNS is not a load balancer.
      both service provide had the same host name, _dmarc, just different value

      any suggestion how to configure it in?
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  • Profile picture of the author PurePay
    One per domain would be best, and also probably was is doable as it wants to be used as dmarc.domainname.com
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  • Profile picture of the author Neha Rajbhar
    Enter DMARC, "Domain-based Message Authentication, Reporting & Conformance". DMARC was created to tell a participating receiving server what to do with a message that fails both SPF and DKIM validation. In other words, what to do if a message claims to be from you, but isn't.
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  • Profile picture of the author calvynlee
    is it without setting a proper DMARC is fine?

    As long as SPF and DKIM set properly, DMARC can be optional?
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  • Profile picture of the author KIORTY
    You`ll need a different provider to do that because having this stuff with identical hosts is impossible, unfortunately, that`s the mechanism of CNAMEs work
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  • Profile picture of the author CloudAnalogy
    NO you can not but if you want to use you need different platform for that.
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  • Profile picture of the author ramonavandusen
    If you want to do that you should use different platform.
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    • Profile picture of the author calvynlee
      Originally Posted by ramonavandusen View Post

      If you want to do that you should use different platform.
      mind to elaborate which platform to use?
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