The email DNS check on your website
Give your visitors a free SPF, DKIM, DMARC and MX check right on your page. Two lines of code, no account, no key.
- Free, commercial sites too
- No cookies, no personal data
- Two lines of code
A free check your visitors will use
Agencies
Web agencies and freelancers who set up email for clients
Hosting and IT
Hosting providers and IT support pages
Blogs and guides
Blogs and guides about email deliverability
Apps and SaaS
Help centers of apps and SaaS that send email from the customer’s domain
Light, private, ready to paste
Public data only
The widget only reads public DNS records through the free MailSenpai DNS check API: no cookies, no personal data.
Details on MailSenpai
It shows the result of the four checks; the link “See the details and how to fix it” opens the full check on MailSenpai with the domain already filled in.
No clash with your site
It runs in its own Shadow DOM, so it doesn’t clash with your site’s styles. Free for personal and commercial sites; 30 checks per hour per visitor.
| Option | What it does |
|---|---|
data-lang | en or it: language of labels and notes. |
data-theme | dark for dark backgrounds (default light). |
Do your website or app emails still leave from the hosting server?
SMTP Senpai is the MailSenpai SMTP relay: it signs your emails with DKIM on your own domain, gives you the DNS records to publish and checks them for you. Servers and data in the EU.