DKIM (DomainKeys Identified Mail) is an email authentication protocol that adds a digital signature to outbound messages, allowing the recipient’s server to verify that the message hasn’t been tampered with and that it truly comes from your domain. This protects your brand and recipients from email spoofing and phishing attacks.
Postmark, a transactional email service known for its fast delivery and strong reputation management, requires you to configure DKIM for your domain to ensure optimal email authentication.
This guide explains how to configure DKIM for your domain when sending through Postmark.
Note: Postmark will always provide you with a custom DKIM signature.
In your Postmark interface, follow the following steps:
Type | Host | TXT Value | TTL |
TXT | 20180301173128pm._domainkey | Paste the key generated here | 1 hour (Default) |
5. Once the key is published, head back to Postmark and select Verify.
To update your DKIM record through Sendmarc, please refer to the Sendmarc DKIM Setup Documentation.
Postmark’s official DKIM configuration guide can be found here.
Find out how to configure your Postmark SPF settings here.