Relevant Products: Exclaimer Cloud - Signatures for Office 365 | Exclaimer Cloud - Signatures for G Suite
Does Exclaimer Cloud support DomainKeys Identified Mail (DKIM)?
Yes, Exclaimer Cloud supports DKIM.
DomainKeys Identified Mail (DKIM) is an authentication method that helps protect both email recipients and email senders from forged and phishing email messages.
DKIM uses cryptography to ‘sign’ email with a private key when it leaves the sending server. This digital ‘signature’ is unique for that email and is added (as a field) to the message header. When the email is transferred it attaches a string of characters with a hash value.
When the signature is generated, part of the private key is stored in the listed domain. The Recipient servers then use this private key to verify the source of the message and verify that the body of the message has not changed during transit – the message passes DKIM and is considered to be authentic.
Exclaimer Cloud strips out the DKIM when it receives an email, but it is re-applied by Microsoft 365 after it has been processed by Exclaimer Cloud and before being sent to the recipient server.
NOTE: Exclaimer Cloud strips out the DKIM when a server-side signature is applied.