How do I find my DKIM key length?

If you’re not an admin, you can check the length of your DKIM key with a web-based tool created by Dave Johnson at https://protodave.com/tools/dkim-key-checker/. If you use Google Apps and a standard DKIM setup, enter ‘google’ (no quotes) in the selector field and your domain in the latter (e.g., techrepublic.com).

How long is a DKIM key?

1024 characters
A 1024 bit DKIM refers to the key length of 1024 characters. The longer the key length, the more challenging it is for hackers to break the DKIM key. For several years, the standard was the 512 bit.

How many characters is a DKIM key?

Most TXT records can have up to 255 characters. For TXT records that include more than 255 characters, DNS adds multiple strings together in a single record. If you’re using a 2048-bit DKIM key, you can’t enter it as a single text string in a DNS record with a 255-character limit.

How do you check if your DKIM is working?

You can test DKIM by sending an email to a Gmail account, then opening it in the web app and clicking on the “reply” button, and selecting “show original”. In the original format, if you see “signed by along with your domain name,” then your DKIM signature is valid.

How do I manually verify a signature in DKIM?

The steps to verify the signature are the fofllowing:

  1. calculate the hash of the body.
  2. compare the calculated hash with the bh value from the DKIM-Signature header of the email.
  3. construct hashed_header (the message which is signed) based on parameter h of the DKIM-Signature header.
  4. verify the signature.

How do I find my DKIM selector?

How can I find my DKIM Selector?

  1. When you open the email, view the “original message” (some email clients might call this view “raw” or “full headers”) of the email.
  2. Search the headers for “DKIM-signature” to find the DKIM signature applied to the message.

How do I add a long DKIM record?

To do this, follow these steps:

  1. Copy the DKIM key value from the resource record.
  2. Paste the DKIM key value in a new line of a text editor.
  3. Split the DKIM key value into two parts, and enclose each part in double quotation marks. For example, the value for “long_string” is split into “long_””string”.

What is DKIM value?

The value is a name or number created by the sender. s= is included in the DKIM signature. d= indicates the domain used with the selector record (s=) to locate the public key. The value is a domain name owned by the sender.

What is DKIM lookup?

DKIM Record Check. DKIM (DomainKeys 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. It works together with DMARC (and SPF).Read more about this topic in our article about DKIM signature.

How do I check my SPF and DKIM records?

mail-tester.com

  1. Enter your domain name in the Domain Name field and give DKIM Selector as “apptivomail”, and click “Check SPF & DKIM keys”.
  2. The result should be displayed as the following:
  3. SPF record should be on a single line, containing only one “all” at the end of the line.

How do I verify DKIM hash?

To validate the DKIM signature, the email receiver will run a DNS query to search for the public key for that domain. The variables provided in the DKIM signature are used to determine where to look for this key. If the key was found, it can be used to decrypt the DKIM signature back the to original hash values.