dkim protocol - SMTPedia

sSMTPedia

Try SMTPing

Email Verification
Featured Guides
Key Topics
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Email Settings
Popular Providers
Configuration Topics
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Marketing Platforms
Platforms
Mailchimp
Mailchimp review
Mailchimp pricing
Mailchimp alternatives
Mailchimp SMTP settings
Mailchimp integrations
Mailchimp API + MCP
Constant Contact
Constant Contact pricing
Constant Contact SMTP settings
Constant Contact integrations
Constant Contact API + MCP
Klaviyo
Klaviyo pricing
Klaviyo SMTP settings
Klaviyo integrations
Klaviyo API + MCP
SendGrid
SendGrid pricing
SendGrid SMTP settings
SendGrid integrations
SendGrid API + MCP
MailerLite
MailerLite pricing
MailerLite SMTP settings
MailerLite integrations
MailerLite API + MCP
ActiveCampaign
ActiveCampaign pricing
ActiveCampaign SMTP settings
ActiveCampaign integrations
ActiveCampaign API + MCP
Brevo
Brevo pricing
Brevo SMTP settings
Brevo integrations
Brevo API + MCP
Amazon SES
Amazon SES pricing
Amazon SES SMTP settings
Amazon SES integrations
Amazon SES API + MCP
Tool Roundups
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Deliverability
Essential Guides
Topics
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Standards & Protocols
Authentication & DNS
Codes, RFCs & MTAs
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Top Picks
Editor’s Selection · the highest-leverage reads on SMTPedia
Must-Read Pillars
Best Of 2026
Free Tool
SMTPing
25 free checks daily
13 validation types, no card required.
Try free →
Free Tools
Generators
Checkers
Premium Tool
SMTPing
25 free checks daily
Email verification with 13 validation types.
Try free →
Downloads
Courses

SMTPedia

The Email Wiki

dkim protocol

Email Glossary

DKIM Record Explained: Syntax, Setup and Common Mistakes (2026)

Alaa 27 August 2026

DKIM is the cryptographic signature that proves your email was not altered in transit. This guide covers selectors, tag syntax, real setup steps for Google Workspace, Microsoft 365, SendGrid, ...