Use DomainKeys Identified Mail (DKIM) to make emails trustworthy

"DomainKeys Identified Mail (DKIM) is a standard that allows senders to sign their email messages with a cryptographic key. Email providers then use these signatures to verify that the messages weren't modified by a third party while in transit.

An email message that is sent using DKIM includes a DKIM-Signature header field that contains a cryptographically signed representation of the message. A provider that receives the message can use a public key, which is published in the sender's DNS record, to decode the signature. Email providers then use this information to determine whether messages are authentic.

DKIM signatures are optional. You might decide to sign your email using a DKIM signature to enhance deliverability with DKIM-compliant email providers."


Enabling DKIM for an email address is a 3 step process:

  1. We will generate and share with you DKIM DNS settings.
  2. The customer must update their DNS settings with the records provided by us.
  3. Once these records are verified, we can enable DKIM for the email address. Please note that we could disable/enable DKIM at any time when needed.
Based on this, please review with the customer if they want to do this configuration and if they will be able to update their DNS settings. Once they confirm let us know so we can provide the corresponding DKIM records.

Additionally, keep in mind some good practices for email sending that will also help the delivery to be completed to the inbox of users:


  1. Use as email sender an email address from the same domain of the customer. Then users who receive the email will have the confidence to open it and not mark it as SPAM.
  2. Always use clean and reliable lists. Ideally these lists should be obtained from a user subscription and be validated both in format and existence. It is never a good idea to use very old lists (email addresses may no longer exist) or purchased (these may contain fake email addresses). Bounce rates should always be kept below 5% and this will only be achieved using clean lists.
  3. The content of the email must be well structured. If images and links are included, it is important to guarantee their origin and reliability to avoid that the email is considered possible SPAM. It is recommended not to use URL shorteners.
  4. Include in emails content an option to unsubscribe and stop receiving emails.
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