Overview
Check your domain's outbound mail authentication (SPF, DKIM, DMARC) with inline validation and a copy-friendly summary.
Sendmaster is a browser extension that displays SPF, DKIM, and DMARC DNS records for the website you are currently viewing to help you verify your configuration or help to spot potential issues. Misconfiguration of DNS records can lead to impersonation of your domain or your legitimate outbound email landing in junk folders by default. What the extension does: When you click the toolbar icon on a tab, the extension reads the hostname of that tab, derives the root domain, and queries DNS TXT and NS records for it. The results render inside the popup.
Details
- Version0.2.0
- Updated24 June 2026
- Size23.09KiB
- LanguagesEnglish (United Kingdom)
- Developer
Email
lewis@conditionalaccess.uk - Non-traderThis developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.
Privacy
Manage extensions and learn how they're being used in your organisation
The developer has disclosed that it will not collect or use your data. To learn more, see the developer's privacy policy.
This developer declares that your data is
- Not being sold to third parties, outside of the approved use cases
- Not being used or transferred for purposes that are unrelated to the item's core functionality
- Not being used or transferred to determine creditworthiness or for lending purposes
