DomainKeys Identified Mail (DKIM) is an anti-tamper protocol that ensures your mail remains secure in transit. DKIM uses digital signatures to check whether the email was sent by the domain it claims to be from.
DKIM uses two actions to validate your messages. The first action takes place on a server sending DKIM signed emails, while the second takes place on a recipient server that checks the DKIM signatures on incoming messages. The entire process is made possible by a private and public key. The private key is kept secret and safe, either on the user’s own server or with their ESP. The public key, however, is added to the DNS records of the user’s domain to help verify email messages.
Once the receiver verifies that an email is signed with a valid DKIM signature, it is clear that the integrity of the email is preserved. Usually, end users cannot see DKIM signatures; the validation is done at the server level.
Emails signed with DKIM appear legitimate, and the recipients are assured that the email is not a spam or phishing attack. DKIM works together with DMARC and SPF to ensure email security. Listed below are some of the advantages DKIM has for brands and organisations.
-
Spam filtering
DKIM can help identify emails that aren't known to be spam and don't need to be filtered. Take for example a receiving system that maintains a whitelist of secure sending domains that can be kept locally or obtained from third-party certifiers. In this case, DKIM can skip the filtering of signed emails from those whitelisted domains and filter the remaining emails more aggressively.
-
Compatibility
DKIM is compatible with existing email infrastructure because it is implemented using DNS records and an extra RFC 5322 header field. It is especially apparent to existing email systems that do not support DKIM.
-
Anti-phishing
DKIM can be used to safeguard against phishing attacks. Mailers in phished domains can sign their messages to prove that they are authentic. Recipients can interpret the absence of a valid signature on emails from those domains as a clue that the mail is most likely forged.
-
Non-repudiation
The non-repudiation feature of DKIM prevents senders from denying that an email was sent by them. This feature becomes crucial for news and media organizations as they sometimes have to confirm that leaked emails are authentic and untampered with.
So, how can you set up DKIM on OFFICE 365 for your custom domain?
-
Sign in to your Admin account and select Admin on the Office365 Admin window.
2. In the Admin Center, choose ‘Exchange’.
3. Go to ‘protection > dkim’.
4. Pick the Domain for which you want to set up DKIM for and click on ‘Enable’.
In Office365, you will need to create two CNAME records to navigate your initial domain. If you haven't created CNAME records, you will have to create them by following the instructions below:
-
Open your DNS management console and add the domain you want to create the CNAME records for.
-
Create a CNAME record using the syntax shown below and click on ‘Save’ or ‘Publish’.
-
Wait for 24-48 hours for the changes to take effect.
Publishing the CNAME records for your custom domain
Let’s take the example of ‘emailauth.onmicrosoft.com’ as our initial domain, also known as the tenant domain. We actually own emailauth.com and after we provide it to Office 365, we need to publish the CNAME records so that ‘emailauth.io’ points to ‘emailauth.onmicrosoft.com’ using the format as shown.
Type: CNAME
Host: selector1._domainkey
Value: selector1-emailauth-io._domainkey.emailauth.onmicrosoft.com
Type: CNAME
Host: selector2._domainkey
Value: selector2-emailauth-io._domainkey.emailauth.onmicrosoft.com
Considering the rules, the domain GUID does not use a full stop ‘.’ but a hyphen ‘-’ instead. This is taken from the MX record of your custom domain, in this case, ‘emailauth.com’.
-
Open the Microsoft 365 Defender portal using your work or school account.
-
Go to Email & Collaboration > Policies & Rules > Threat policies page > Rules section > DKIM.
-
On the DKIM page, choose the domain by clicking on the name.
-
Change the Sign messages for this domain and change the DKIM signatures setting to ‘Enabled’.
-
Click on ‘Rotate DKIM keys’, and you’re done.
You can set up DKIM similarly for other hosting services as well.
Original Content Source :-
If you own an email domain and have not activated it for business emailing, it's time to get your act together.
You've seen the huge benefits of Active Directory domains in the past for business email domains but you may not have realized that there's a domain extension that can help make it easier to secure your domains for your business.
One of the most important ways to do that is to use Domain-based Message Authentication and Reporting (DMARC) technology.
One of the biggest threats we face today are spammers attempting to use fake email accounts to send spam and corporate attackers using stolen employee credentials to infiltrate company systems.
One of the biggest attacks we've seen carried out by a spammers Network is identified as DMARC.What are Parked Domains?Parked domains are a great way to create additional brand equity for your business.One way this is done is by purchasing domain names that are already in use by another business.
Parked domains have been popular for many years.
The reason why you should study Current Affairs in the right way is because it and GK is clearly a very competitive field with many students and courses to study for.
That's why I've put together a list of ‘must have' resources for you should you wish to succeed on your exams and study hard for your future competitive shot at the top universities, corporations and corporate organizations.
This article aims to help you pick the best strategy for you to follow for studying for your competitive exams.It's also important to understand how the syllabus for your competitive exams works in order to evaluate what works best for you.
These are some key points you need to consider when preparing for competitive exams.
The biggest mistake that students make is to believe that once they study hard and practice good habits they will automatically be better prepared for exams.
The best way to prepare for exams is to learn as much as you can about the subject you're studying, but also keep working on other parts of your study program.
DomainKeys Identified Mail (DKIM) is an anti-tamper protocol that secures your emails while in transit.
It uses digital signatures to confirm whether the email was sent by an authentic domain.What is DKIM?The first DKIM action occurs on the server that sends a DKIM signed email, while the second takes place on the recipient server that checks DKIM signatures on incoming emails.
The public key, on the other hand, is added to the DNS records of your domain to broadcast to the world and help verify your emails.
Once the receiver verifies that an email is signed with a valid DKIM signature, it’s clear that the integrity of the email is preserved.Usually, DKIM signatures are not visible to end-users and the validation occurs at the server level.Benefits of DKIMFor email receivers, the key benefit of DKIM is that it allows the signing domain to accurately identify a stream of legitimate emails, making domain-based blacklists and whitelists more effective.
Spam filteringDKIM can help identify mail that isn't known to be spam and does not need to be filtered.
If a receiving system maintains a whitelist of authentic sending domains that can be kept locally or obtained from third-party certifiers, it can skip the filtering of signed emails from those domains and filter the remaining emails more aggressively.2.
In the fiercely competitive cyber world, it is necessary that you do your marketing well but, at the same time, pivotal that you’re aware of the basic security measures to safeguard your email sending habits.
Reverse DNS (PTR)SPF (Sender Policy Framework)DKIM (DomainKeys Identified Mail)DMARC (Domain-based Message Authentication, Reporting, and Conformance) REVERSE DNS A DNS query for the domain name associated with a particular IP address is known as a reverse DNS lookup.
This achieves the inverse of the more widely used forward DNS lookup, which queries the DNS system for an IP address.Reverse DNS lookups seek for a PTR (pointer) record on DNS servers.
If the server doesn't have a PTR record, it won't be able to resolve a reverse lookup.
PTR records include IP addresses with their segments reversed and ‘.in-addr.arpa’ appended to them.
Sender Policy Framework (SPF)Sender Policy Framework (SPF) is an email authentication protocol that allows domain owners to specify which email servers are permitted to send emails from their domain(s).
