Tag: Email Authentication
Articles about email authentication — SPF, DKIM, DMARC, and other protocols that verify sender identity.
DKIM Fail — Diagnosis and Solutions
DKIM fail means the recipient could not verify the email's digital signature. Learn the causes of failure and how to systematically fix them.
· 9 min read
ARC — Email Authentication Across Forwarding
ARC (Authenticated Received Chain) preserves email authentication results across forwarding hops. Learn how ARC works and when to deploy it.
BIMI — How to Display Your Brand Logo in Emails
BIMI lets you display your brand logo in recipients' email clients. Learn how to set up BIMI, the requirements, and which clients support it.
DKIM Selectors — What They Are and How to Use Them
A DKIM selector links an email signature to its public key in DNS. Learn how selectors work, naming conventions, and how to rotate keys safely.
Email Bounce Rate — What It Is, Types, and How to Reduce It
Bounce rate measures the percentage of undelivered emails. Learn the difference between hard and soft bounces, acceptable thresholds, and how to…
Google and Yahoo Email Sender Requirements
Google and Yahoo require SPF, DKIM, and DMARC authentication from email senders. Learn the specific requirements, thresholds, and enforcement…
NIS2 and Email Security — What the Directive Requires
NIS2 transforms email authentication from best practice to legal obligation. Learn which requirements apply to SPF, DKIM, DMARC, and email encryption.
SPF 10 DNS Lookup Limit — How to Count and Fix It
SPF records are limited to 10 DNS lookups. Learn which mechanisms count, how to audit your record, and four strategies to stay within the limit.
Setting Up SPF, DKIM and DMARC at Czech Hosting Providers
Complete guide to setting up SPF, DKIM and DMARC at WEDOS, Forpsi and Active24. Exact DNS records, activation steps and troubleshooting for each…
DMARC Fail — What It Means and How to Fix It
DMARC fail means your email failed authentication — usually due to missing SPF/DKIM or alignment issues. Learn how to diagnose the cause and fix it.
DNS Records for Email — A Complete Guide
MX, TXT, CNAME, PTR — every DNS record you need for email delivery and security in one place. Examples, rules, and a ready-to-use checklist.
How to Set Up SPF, DKIM, and DMARC for Google Workspace
Step-by-step guide to setting up SPF, DKIM, and DMARC for Google Workspace. From DNS records to DKIM activation in Admin console and DMARC deployment.