Wisdom – DMARC Deployment

Deploy SLOWLY, We strongly recommend ramping up DMARC use slowly by employing these policies in this order. First, monitor your traffic and look for anomalies in the reports, such as messages that are not yet being signed or are perhaps being spoofed. Then, when you’re comfortable with the results, change the TXT record policy setting […]

What is DMARC and what are its advantages?

This article is part of Explained Simply Series, A series that aims to explain complex terminologies in a short & concise manner. DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication protocol. It builds on the widely deployed SPF and DKIM protocols, adding a reporting function that allows senders and receivers […]

Why DMARC?

People and companies around the world suffer from the high volume of spam and phishing on the Internet. Over the years several methods have been introduced to try and identify when mail from (for example) myrealcompany.com really is, or really isn’t coming from myrealcompany.com. However: These mechanisms all work separately and  isolated from each other Each […]

Forging the sender address

One of the ways an attacker tries to penetrate an organisation is by emails. An attacker in a remote part of the planet can send a malicious email and start attacking an organisation. For obvious reasons an attacker would not want to be identified, therefore the attacker forges the sender address to cover his/her tracks. […]

Types of E-Mail Abuse where the Sender Address is Forged

Spammers  – As they want to avoid receiving non-delivery notifications (bounces) to their real addresses. Fraudsters  – As they want to cover their tracks and remain anonymous. Computer worms – Worms want to cause confusion or just don’t care about which sender addresses they use. Phishers (password fishers) want to impersonate well-known, trusted identities in order […]

DKIM KEYS Consideration

Messages with DKIM signatures use a key to sign messages. Messages signed with short keys can be easily spoofed (see http://www.kb.cert.org/vuls/id/268267), so a message signed with a short key is no longer an indication that the message is properly authenticated. To best protect  users, Gmail will begin treating emails signed with less than 1024-bit keys […]

DKIM Simplified

DomainKeys Identified Mail (DKIM), is a mechanism that allows verification of the source and contents of email messages. Using DKIM, sending domains can include a cryptographic signature in outgoing email messages. A message’s signature may be verified by any (or all) MTAs (mail servers) during transit and by the Mail User Agent (MUA) upon delivery. […]

What is SPF ?

Sender Policy Framework (SPF) is an email validation system designed to detect and block forged or spoofed emails. This is done by verifying the sender’s email server before delivering all legitimate email to a recipient’s inbox. but How ?This is achieved when the network owner creates an SPF entry in the Domain Name System (DNS) record for […]

How can I tell if DMARC is making a difference?

A day or two after a domain owner publishes the simplest monitoring-mode DMARC record in DNS, they will begin to receive reports from DMARC receivers with statistics about email sent to them using the domain owner’s domain. In other words, if you own or operate example.com and publish a DMARC record requesting reports, you will […]

DMARC : Need of enforcement in financial institutes

Is this piece of Email legitimate or just a really good fake mail trying to deceive you? E-mails perpetuate a lot of attacks and are involved in more than 90% of malware and spoofing attacks. When there was no DMARC, organizations found it really tough to figure out if the mail is legit or not […]

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