Deep-dive articles on networking, cybersecurity, DNS, and modern IT systems for developers and tech enthusiasts.
Emails land in spam due to a mix of factors — broken SPF/DKIM/DMARC records, poor sender reputation, low engagement, and spammy content. This guide breaks down every cause and gives you a step-by-step checklist to get back in the inbox.
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An SPF record tells the world which servers are allowed to send email from your domain. Learn how SPF works, how to write it correctly, and the hidden mistakes that break it silently.
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DMARC tells receiving mail servers what to do when an email fails authentication. Learn how it works, what the three policy levels mean, and how to protect your domain step by step.
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Learn what a DKIM signature is, where it appears in your email, and how it works to protect your domain from spoofing and keep your emails out of spam.
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Email spoofing is when attackers send emails that appear to come from your address or domain without accessing your account. This beginner-friendly guide explains how spoofing works, why SMTP allows it, and how SPF, DKIM, and DMARC protect your domain from fake emails and phishing attacks
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DMARC fail means an email claiming to come from your domain failed SPF or DKIM alignment checks. Learn the real causes of DMARC failures, how alignment works, common error messages, forwarding problems, and how to fix DMARC issues in Mailchimp, SendGrid, Office 365, and Google Workspace.
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Learn how DMARC record syntax works, including every DMARC tag, allowed values, real examples, DNS setup instructions, and common mistakes to avoid when configuring DMARC authentication.
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Learn what DMARC is, how it works with SPF and DKIM, and how to check and secure your domain using simple DNS-based email authentication tools
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SPF permerror explained: what it means, why it happens, and how to fix it quickly to restore email deliverability and avoid SPF configuration errors.
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Learn SPF record syntax step by step with real examples. Understand mechanisms, qualifiers, and how to correctly configure SPF to prevent email authentication issues.
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Master your email deliverability! Our latest guide explains SPF record setup, syntax, and verification to keep your domain secure and your emails in the inbox
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DKIM (DomainKeys Identified Mail) is an email authentication method that adds a cryptographic digital signature to every email you send. This signature proves to the recipient server that the email was actually sent by you and—more importantly—that the content wasn't tampered with during transit.
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DNS records are essential components of the Domain Name System (DNS) that connect domain names to IP addresses and control how websites and emails function. This guide explains key DNS record types such as A, AAAA, CNAME, MX, and TXT records, and how they are used for website hosting, email configur
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