What is DKIM? (DomainKeys Identified Mail) | Simple and easy



DKIM (Domain Keys Identified Mail) is an email authentication technique that allows the receiver to check that an email was indeed sent and authorized by the owner of that domain. This is done by giving the email a digital signature. This DKIM signature is a header that is added to the message and is secured with encryption.

Once the receiver (or receiving system) determines that an email is signed with a valid DKIM signature, it’s certain that parts of the email among which the message body and attachments haven’t been modified. Usually, DKIM signatures are not visible to end-users, the validation is done on a server level.

Implementing the DKIM standard will improve email deliverability. If you use DKIM record together with DMARC (and even SPF) you can also protect your domain against malicious emails sent on behalf of your domains. Though, in practice, these goals are achieved more effective if you use the DKIM record together with DMARC (and even SPF). DMARC and DMARC Analyzer use both SPF and DKIM. Together they provide synergy and the best result for email security and deliverability.

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  1. Every tutorial video related to server is really useful for me . Keep uploading videos sir, about server site issue,migration,ftp, etc..

  2. Hello, is there a way to hide meta data from sender client over SMTP ? To encrypt my Meta data pe something to protect and remain anonymous , is this ok The practice as company purpose email server? I use Linode vps and applied DKIM, SPF and Dmac

  3. I fixed DMARC but the DKIM keeps failing and I don't even know why. Can you please let me know what could be wrong? I don't even know where to look.

  4. Thank you, very well explained. Once the recipient is getting the email, he can use the public key to decrypt the message but how it ensure it has not been modified? He doesn't have the private key to ensure that the private key is the correct one. Please explain how the recipient ensure the integrity of the email
    Thank you

  5. Very useful video… our email exchange is office 365. One email I'd is used for mass emailing for marketing purpose . Want to configure DKIM. How to generate public and private key. Where to update the private key in office 365

  6. Hello, good morning. When created subdomains in Cpanel for my site, Cpanel automatically created DKIM & SPF TXT records for all subdomains. I have now signed up for G Suite email and deleted all default MX records in Cpanel and configured Google MX records, emails are working fine. Can I delete all DKIM TXT records and SPF TXT records created by Cpanel for all subdomains and replace with just one main DKIM and SPF TXT record from Google since I will not be using any subdomains for emails. My understanding is DKIM & SPF has no impact on website and it subdomain sites. Looking forward to your feedback. Best regards

  7. So say you don't do the dkim, spf, dmarc and you send out a bunch of emails. Now everything going to spam and I had Google help me fix the 3 things. How do I get email to quit going to spam? Thanks for your help!

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