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DKIM (DomainKeys Identified Mail) is an email authentication method that uses cryptographic techniques to confirm the source of an email message. It is designed to identify messages sent from authorised domains and prevent forgery by unauthorised use of email addresses, which can mislead recipients about the true source of correspondence.

How does DKIM work?

1. Creating a digital signature: When sending an email from a domain that has DKIM activated, the sender’s mail server creates a unique digital signature for that domain, using the private key assigned to that domain.
2. Including the signature in the email header: The created digital signature is embedded in the email header as part of its metadata, which remains invisible to the recipient.
3. Publishing the DNS record: In order to allow recipients to check the authenticity of the signature, the domain owner publishes the DKIM public key in the DNS records of his domain. This key is used by the recipients’ mail servers to verify the digital signature.
4. Recipient verification process: When the email arrives at the recipient’s mail server, this server extracts the DKIM signature from the header and uses the public key, published in the DNS of the sender’s domain, to verify the signature.
5. Signaturematch check: The recipient’s mail server uses the public key to decrypt the digital signature and compare it with the signature generated from the content of the received email. If the signatures are identical, this indicates that the content of the message is intact and that it originated from the declared domain.

Failure of DKIM verification or lack of DKIM activation for a domain does not necessarily automatically indicate that the email is malicious, but it may be a signal for further verification. DKIM is one of many email authentication methods that often work in tandem with other systems such as SPF (Sender Policy Framework) and DMARC (Domain-based Message Authentication, Reporting, and Conformance) to provide comprehensive protection against cyber threats.

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an advanced system that provides authentication and report generation for emails, working with existing SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) mechanisms. The aim of DMARC is to improve and control the email authentication process and enable the generation of detailed reports on attempts to use a domain for unauthorised messaging.

The main objectives of DMARC include:

1. Domain usage protection: DMARC enables message writers to define policies that help prevent unauthorised use of their domains to send emails, which in turn allows suspicious messages to be blocked or diverted to spam.
2. Confirmation of message authenticity: Through integration with SPF and DKIM, DMARC verifies that an email is indeed from the expected source, protecting against forgery.
3. Report generation and delivery: DMARC provides a mechanism to provide reports to domain owners on the authentication results of their messages, making it easier to monitor and resolve email security issues.

How does DMARC work?

1. Implementation of DMARC policy in DNS: Domain owners wishing to use DMARC publish a special policy in their domain’s DNS records, specifying actions for emails that do not pass SPF and DKIM verification.
2. Recipient verification process: When an email arrives at the recipient’s server, the presence and policy of the DMARC policy for the sender’s domain is checked. Authentication of the message using SPF and DKIM is then performed.
3. Reporting and analysis: Once the verification is complete, the recipient server generates a report containing the results of the authenticity checks according to the DMARC policy and sends it to the domain owner. This allows detailed analysis and corrective action to be taken.

DMARC is a key element in an email security strategy, making a significant contribution to reducing fraudulent messages and improving the reliability of email correspondence.

SPF (Sender Policy Framework) is an email authentication protocol designed to confirm the authority of email servers to send messages on behalf of a domain. Implemented through Domain Name System (DNS) records, SPF is a key part of a defence strategy against phishing, spam and other types of email abuse.

How does SPF work?

1. Publication of the SPF record in the DNS system: The administrator of a domain defines and publishes a special SPF record in DNS, which specifies which mail servers are authorised to send emails on behalf of that domain. This is a preventive measure to designate trusted mail sources.
2. Checking authorisation by the recipient server: When the recipient’s mail server receives an e-mail, it checks whether an SPF record has been defined for the sender’s domain in DNS. It then verifies that the IP address of the server from which the message came is on the list of servers authorised by that domain’s SPF record.
3. Decision to accept the message: Based on the result of the verification, the recipient server makes a decision about the future of the e-mail message. If the sender server is included in the SPF record as authorised, the e-mail is forwarded to the recipient. Otherwise, the e-mail may be rejected or moved to the spam folder.

SPF is one of the cornerstones of secure email exchanges, reducing the possibility of impersonating senders and thus helping to reduce the number of unwanted messages. It works best when combined with other authentication methods such as DKIM and DMARC, creating a complex email security system.

Having a dedicated IP address comes with a number of benefits that can make a significant difference to the efficiency and security of email communications. Here are the key advantages:

1. Increased sender credibility: A dedicated IP address is perceived as more trustworthy by email filtering systems. As a result, messages sent from a unique IP address are more likely to reach inboxes, resulting in better open rates and recipient engagement.
2. Independent sender reputation: By using an individual IP address, the sender isolates their reputation from the actions of other users using shared IP addresses. This allows the sender to optimise their sending strategy and deliver emails more effectively, regardless of the potential negative actions of other senders.
3. Full control over the email service: A dedicated IP address offers the user full control over the configuration of the email server, allowing security settings and mail functions to be customised. This, in turn, contributes to the efficiency and security of the messages sent.
4. Minimised risk of blocking: Using your own IP address reduces the risk of a sender being wrongly categorised as a spam source and avoiding being blacklisted. This avoids unwanted delays or problems with message deliverability.
5. Detailed reporting: Holders of dedicated IP addresses have access to more detailed data on the deliverability, receipt and authentication of their emails. This enables a quick response to potential problems and the effective optimisation of email communication strategies.

Yes, our service ensures that regular backups are carried out, as is the case with the other services we offer. We allow our customers access to backups made up to 5 days back, thus guaranteeing an additional layer of security and the possibility of recovering data in the event of loss or damage.