Email deliverability guides
Learn what the records mean, then use the tools to verify your domain.
How to Read Email Headers
Learn which email headers explain sender identity, delivery path, and authentication results.
How to Fix SPF Fail
A practical checklist for fixing SPF failures without breaking legitimate email senders.
What Is a DKIM Selector?
Understand DKIM selectors and how they point receivers to the right public signing key.
DMARC Policy Guide
Learn how p=none, quarantine, and reject affect domain protection and email delivery.
Why Email Goes to Spam
Common technical reasons legitimate email lands in spam and how to investigate them.
SPF Record Examples for Google Workspace, Microsoft 365, SendGrid, Mailgun, Zoho, and Amazon SES
Copy practical SPF examples and learn how to combine common email providers into one safe TXT record.
DMARC Record Examples for p=none, quarantine, and reject
Compare practical DMARC TXT records for monitoring, gradual enforcement, and strict domain protection.
How to Remove Your IP from Email Blacklists
A practical cleanup checklist for sender IPs that appear on DNS blocklists or suddenly land in spam.