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Security & SSL
7 min read
Hardening Web Server SSL/TLS Configuration
Achieving a 100% Qualys SSL Labs score requires disabling legacy protocols, enforcing E...
Security & SSL
8 min read
Why Wildcard SSL Requires DNS-01 Validation
While standard single-domain certificates use simple HTTP-01 file challenges, Wildcard...
Email Deliverability
6 min read
Protecting Email Traffic in Transit with STARTTLS
By default, SMTP transmits data in plain text unless negotiated with STARTTLS. M...
Email Deliverability
7 min read
How Real-time Blackhole Lists (RBLs) Work
RBLs maintain real-time databases of IP addresses observed sending spam, harboring compr...
Email Deliverability
8 min read
Understanding SMTP Response Status Codes
When an MTA communicates with a remote mail server, every transaction returns a 3-digit s...
Email Deliverability
7 min read
What is BIMI and Why Does it Boost Open Rates?
Brand Indicators for Message Identification (BIMI) enables email senders who have e...
Email Deliverability
7 min read
How SpamAssassin Evaluates Incoming Messages
SpamAssassin runs hundreds of heuristic tests against incoming email headers, MIME st...
Email Deliverability
8 min read
Why Brand-New IPs Experience Initial Throttling
To mailbox algorithms at Gmail and Yahoo, a newly provisioned IP has zero historic...
Email Deliverability
7 min read
Why Mail Servers Require Forward-Confirmed Reverse DNS
When an SMTP server connects to Google Mail, Gmail executes a Reverse DNS l...
Email Deliverability
10 min read
Why Emails Land in Spam: The Authentication Problem
Major mailbox providers (Google Workspace, Gmail, Microsoft 365, Yahoo) enforc...
DNS & Domains
6 min read
The Risks of Public WHOIS Registrant Records
When a domain is registered without privacy protection, ICANN regulations mandate tha...
DNS & Domains
6 min read
Securing Your Domain with CAA Records
Mandated by the CA/Browser Forum, Certificate Authorities must verify DNS CAA records before...
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