What Is BCC in Email? How Blind Carbon Copy Works
BCC (Blind Carbon Copy) hides your address from other recipients. Learn how it works technically, when to use it, when to avoid it, and the etiquette rules that prevent awkward mistakes.
The Complete Guide to Email Authentication: SPF, DKIM, DMARC, and Beyond
Everything you need to know about email authentication in one place. How SPF, DKIM, and DMARC work together, how to set them up, and common mistakes to avoid.
Email Reputation Systems Explained: How IP and Domain Reputation Determine Delivery
Your email deliverability depends heavily on the reputation of your sending IP and domain. Learn how reputation is built, lost, and monitored using tools like Google Postmaster Tools, Microsoft SNDS, and Sender Score.
The Problem with Bayesian Spam Filtering: Why Pattern Matching Is Not Enough
Bayesian spam filters have protected our inboxes for 20 years. They are brilliant at pattern recognition. But they do not understand what an email actually says - and that gap is where modern phishing thrives.
Everything You Need to Know About Using Subdomains for Email
info.brand.com, news.brand.com, mail.brand.com - subdomains are everywhere in email. When are they legitimate, when are they phishing, and should you use them for your own domain?
What Your Email Metadata Reveals About You (Even When the Content Is Encrypted)
You encrypted the body. But the headers still show who you emailed, when, from where, which device, which client, and how often. Email metadata is a surveillance goldmine - here is what it contains and how to limit your exposure.
The Importance of TLS Encryption in Email: What You Need to Know
Most email travels unencrypted between servers. TLS changes that - but only if both sides support it. Here is how it works and why it matters.
Understanding Email Headers: A Complete Guide
How to read email headers, what each field means, and how to use them to diagnose delivery problems and spot phishing.
Why Strict DMARC Rejection Is Not Always the Right Choice
DMARC p=reject sounds like the gold standard. But blindly rejecting DMARC failures breaks email forwarding for thousands of users. Here is the nuance.
What Is ARC (Authenticated Received Chain) and Why Email Forwarding Needs It
ARC allows email forwarders to preserve authentication results across hops. Learn how Authenticated Received Chain works, who supports it, and why it complements SRS rather than replacing it.
Top 10 DNSBL Providers Compared: Spamhaus, Barracuda, SpamCop, and More
A practical comparison of the most widely used DNS-based blocklists. Learn how Spamhaus, Barracuda, SpamCop, SURBL, and others work, what they list, and which ones are worth using.
Why Your Email Forwarder Breaks SPF (and How SRS Fixes It)
Email forwarding breaks SPF authentication by design. Here is why it happens, what SRS does to fix it, and why this matters for deliverability.
