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How to retrieve DMARC record of DNS using java api?


How to retrieve DMARC record of DNS using java api?

By : ten.bv
Date : November 19 2020, 03:59 PM
wish of those help I want to retrieve the DMARC related record of DNS. This has been implemented by this
code :
private void performDNSLookup(String address) {
    try {
        Resolver resolver = new SimpleResolver();
        Lookup lookup = new Lookup(address, Type.TXT);
        lookup.setResolver(resolver);
        Record[] record = lookup.run();
        for (int i = 0, len = record.length; i < len; i++)
            System.out.println(record[i].rdataToString() + "\n"
                    + record.length);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}


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Understand DMARC Email Record

Understand DMARC Email Record


By : Amjad Ali
Date : March 29 2020, 07:55 AM
Hope that helps The probable cause of the discrepancy between & is that your envelope "mail from" & your header "from" are not on the same domain. is the SPF alignment test, which verifies that both the "From" field in the message header & the RFC 5321 "MAIL FROM" are from the same domain, whereas only tests whether or not the sending MTA is an authorised sender for the domain in the domain in the RFC 5321 "MAIL FROM".
There's a good answer here: DMARC -spf and DKIM record queries
I've published a DMARC record, but it's only checked sporadically

I've published a DMARC record, but it's only checked sporadically


By : Shashank Bhadauriya
Date : November 07 2020, 03:01 PM
this one helps. Generally speaking, DMARC is only needed when SPF or DKIM lookups fail, as their main purpose is to say what to do in the event of a failure. There's no particular reason to look up DMARC if SPF and DKIM pass, but I guess gmail must just do it anyway sometimes. Many mail servers don't do SPF, DKIM, or DMARC tests at all. If you had a case where gmail was failing a check and not looking up DMARC, I'd be a bit more concerned.
How long does a DMARC record take to be recognized?

How long does a DMARC record take to be recognized?


By : user2771633
Date : March 29 2020, 07:55 AM
should help you out What happens is that for many DNS hosting providers, you will only type "_DMARC" as the host / name and the tool will add your domain name automatically.
I had written "_DMARC.mydomain.com" instead only "_DMARC" which generated the wrong host / name _DMARC.mydomain.com.mydomain.com
DMARC says SPF fail even with SPF record

DMARC says SPF fail even with SPF record


By : Ronald Winstead
Date : March 29 2020, 07:55 AM
should help you out From first glance this could be related to DMARC requiring your Mail From (return-path) and From address domains to match. When you use an Email Service Provider they will usually have their own email address to capture bounces, which causes DMARC to fail with SPF.
We built a free labs project to track DMARC results. It might help you discover more sources. You can see it at http://dmarc.postmarkapp.com.
DMARC -spf and DKIM record queries

DMARC -spf and DKIM record queries


By : Pankaj KT
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further SPF: you're right, the vendor would need to change the envelope from address to align to your organizational domain. Some will do this very easily, others are difficult, and some won't change the envelope from at all. One important thing to remember when you're having a third-party change their envelope-from is that, in most cases, the change would blind them to bounces - the third party needs bounces for list hygiene etc - which is a problem. In order to avoid this, have them use a subdomain of your organizational domain and set up an MX there. For example, if you are companyname.com and your third party is vendorname.com, having them use an envelope-from of vendor-bounces.company.com and then setting up an MX record back to vendorname.com for vendor-bounces.company.com will solve the problem in an aligned fashion.
DKIM: DKIM itself checks neither address. If you look at a DKIM signature, you'll see a d equate such as d=gmail.com. This domain is what is used to retrieve the public key to verify the message. DKIM itself has no such requirement, but DMARC requires the d= domain in the DKIM signature to match the organizational domain in the from header. This is identifier alignment, as described in Section 3.1 of RFC 7489. (https://tools.ietf.org/html/rfc7489#section-3.1) At a practical level, you must publish the public key in your DNS namespace, and the signing third party must use the attendant private key to sign a message. By publishing the pubkey in a particular DNS namespace, say as selector._domainkey.companyname.com, you are authorizing any holder of the private key, like vendorname.com, to send DMARC-authenticated email for companyname.com.
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