Use of DKIM to Prevent Domain Spoofing

DKIM, the most trusted email validation, and authentication method are highly responsible since it has to ensure the sender of the email is the legitimate owner of the domain from whose domain the mail is sent.

20/08/2020 By

DKMIN Domain Spoofing HandySends

In the early '80s, there wasn’t any specific requirement for authentication and justification of messages while using emails and SPT (simple mail transfer protocol). Gradually emails became an extremely important part of a business, brand, an individual, and their existence as an integral part of the society. Emails have become an extremely important part of any communication channel and with this importance; it has also given rise to people with malicious intentions.

When enabled, Domain Keys Identified Mail (DKIM) will prevent malicious third parties from spoofing the email domain.

Usually, Email satirizing or deceiving (in common language) occurs when a person with malicious intent shoots emails to addressees from a suspicious email address on behalf of a trusted brand or sender, and in return trying to gather sensitive personal information from the recipients.

Decoding DKIM?

It is important to understand what (DKIM) refers to -Domain Keys Identified Mail (DKIM) is the most trusted technique to verify, it allows the addressee to verify that the email is indeed sent by the respective domain owner. This is conducted by using digital signatures in the email which may not be visible to the receiver, as authentication is done at the server level.

DKIM came into use in 2004 after the merger of the two prevalent specifications, Domain Keys (by Yahoo) and Identified Internet (by Cisco).

Leading ISP’s like Gmail, Yahoo, Microsoft, verify incoming emails for DKIM signatures before being received by the recipients.

What is the way DKIM functions?

DKIM, the most trusted email validation, and authentication method are highly responsible since it has to ensure the sender of the email is the legitimate owner of the domain from whose domain the mail is sent.
The two simple steps are:

⦁ The sender creates a cryptographic public/private key pair, install it on their email server, and then create a DNS TXT record that contains the isolated key. Each outgoing email of the sender is signed by the email server’s private key.

⦁ The receiver can then verify the digitally signed email by using the sender’s public key stored by using

How DKIM avert domain satirizing?

When DKIM is implemented, a brand/sender is giving an undertaking to the recipient that the email sent is authenticated to be sent from the actual domain of the sender. The server sends a calculated encoded hash of your mail literature simply using an isolated key. This is added as a DKIM signature to the email headers. The equivalent isolated and private use key in the sender’s domain’s DNS record is verified by the receiving server thereby decrypting the encoded hash and then calculating a new hash based on the contents of the email and thereafter check to see if the decrypted hash equals the new hash. If it matches DKIM is passed else the email may be treated as suspicious.

Why is the significance of DKIM?

DKIM is one of the methods a recipient can authenticate the legitimacy of the sender’s email and emails landing into “junk” or “spam” folders. Without DKIM, some ISP’s may block the sender’s email, thereby the intended recipient may not receive the communication at all, and that may lead to a cascading negative impact on the overall indented purpose of the email communication.

How shall I put DKIM in use for SendGrid?

Build an account and select the option for either guide by entries or computerized security systems. When one selects automated security, SendGrid will manage the SPF and DKIM data. Once done, even if the sender adds a new system address {IP} or alters any changes to the account, SendGrid will automatically update both SPF and DKIM settings. SendGrid automatically enables DKIM to help improve email deliverability, irrespective of shared IP, or dedicated IP.

Ways to verify DKIM

DKIM can be tested with a range of online tools. DKIM analyzer and checker help to check the accuracy of DKIM records.
The first method is to simply use a domain and then the selector both detached by a colon.
The next method is to use the host id name format from the record.
It is recommended to test any changes made in SPF and DKIM records before starting to send messages.

What DKIM have challenges with?

While senders and recipients are able to implement a verification process and authenticate the sender's email, respectively, there are certain things that DKIM does not do.
⦁ DKIM does not guide the ISP’s as to how to manage a particular instruction. Unlike DMARC, DKIM does not guide if and when instructions do not meet your expectations or qualifies the verification process.
⦁ DKIM does not account for the sender’s messages pertaining to the malicious intentions if any. In spite of a said message passes the DKIM verification process, the malicious intentions may still remain.
⦁ DKIM does not stop a suspicious email from being forwarded, causing similar damages to the next recipient.

How dissimilar is SPF compared to DKIM? DO we need to use both?

2019 Email Deliverability Guide will help to understand how to have the email delivered correctly. SPF will allow a sender to update the ISP as to which IP’s can send messages on the sender’s end. DKIM only permits the ISP’s to verify the email sent by the sender is as per the original content.

Both SPF and DKIM do have their own individual shortcomings in fully securing an email. SPF does not verify messages and DKIM fails to verify the origin of the message. Both SPF and DKIM may help to verify the legitimacy of the claimed domains (e.g. but the email domain may still be spoofed by a suspicious sender (e.g. jamesd@ or james@).

Understanding the highest DKIM tips?

⦁ DKIM is the last part of any message that is sent. The sender should not add any character after this.
⦁ Top ISP’s recommend that both header and body should be signed
⦁ To use Yahoo's feedback loop, DKIM signature is essential
⦁ Standard DKIM signatures are used in the header inevitably by almost all SendGrid clients

Assist all the inbox service providers by validating your correspondence mail

To make sure receipts respond to the sender's emails, the ISP’s must be updated by the sender by registering DKIM ( primarily those whose domain is with DKIM). This way the ISP will obstruct any dominion which is not featured in the list to safeguard the Sender's interest.
DKIM will support in two primary ways :
⦁ If the email has an effective signature
⦁ Which domain has it been signed by

DKIM enhances the chances of the email being delivered though it does not ensure the same.
If an account/domain is hacked, DKIM helps to prevent any ancillary fallout.
Such preventive measures may help the sender's reputation in the long run.


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