There are options to enable authentication of e-mail to increase the deliverability and security of your outgoing e-mails. In this tutorial we will explain how to enable this authentication to achieve the best results when sending emails in order to prevent your emails from being flagged as spam.

Email authentication is required because of the way the email system was originally developed. This makes it very easy to fake a message. An example is an e-mail claiming to be from your domain, when in fact it is a scam designed to steal money or spread malicious software.

Authentication technology prevents this from happening by giving internet servers an  identification check to ensure that the sender is legitimate. The emails that fail to pass the authentication checks can be blocked or put through additional filters, potentially preventing them from reaching the inbox.

How do I activate the authentication?

cPanel includes an easy way to enable authentication of sent emails. This option is available in cPanel in ‘E-mail Authentication’ where you will find at your disposal the DKIM and SPF. Ideally, both options are active, so that we get better results in terms of email delivery.

About DKIM

DKIM helps to verify the integrity of the sender of a message. It allows email system to prove that a message was not altered in transit (which means it is not forged), and that the message came from the specified domain.

About SPF

This function tries to prevent spammers from sending e-mails while forging the name of your domain as the sender (spoofing). This authentication function adds the IP address to a list specifying which computers are authorised to send email from your domain. It verifies that messages sent from your domain are from the listed servers, reducing the amount of backscatter you receive.

Notes:
1. The full operation of DKIM and SPF after its activation, it may take up to 24 hours to really get better results with the delivery of e-mails.

2. If you have a VPS, it is important to remember that rDNS also needs to be properly set.

3. There are other issues that need to be evaluated when an email is delivered to the SPAM box. Among them, the type of title, the body text and the attachment.