Email Deliverability API & Checker

Instantly audit SPF, DKIM & DMARC to stop landing in spam.

Developer Tools

Added August 11, 2026 · Last analysed August 11, 2026 · via

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Screenshot of Email Deliverability API & Checker

StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 11 August 2026; the live site may have changed since.

Email Deliverability API & Checker is early-stage. Main gaps: missing Permissions-Policy and Content-Security-Policy, incomplete legal pages, and no robots.txt or sitemap.

Launched on Product Hunt on August 11, 2026. The site is hosted on Railway. We've detected 3 technologies on this site, covering backend framework, hosting, and security. The stack includes Django, HSTS, and Railway.

It's on one of the most common stacks we track, shared by 584 launches and more locked down than the typical Product Hunt launch.

If you own this site, refresh the snapshot and see the full fix list any time →

2.7

StackScope Score

Poor

29/100 Launch Readiness

Needs work

4/6 Security Headers

Decent

0/3 Legal

Missing

0/2 Crawl files

Missing

93/100 Performance

Fast

Vibe Score 0 · No AI signals

How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (3)

Infrastructure

Hosting	Railway
Security	HSTS

Other

Backend framework	Django

Infrastructure

Network

RAILWAY - Railway, US

AS400940 · US

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

Green hosting

Not green hosted

No green-energy record. Data from The Green Web Foundation.

SSL Certificate

Let's Encrypt

Valid 29 Jul 2026 to 27 Oct 2026

Certificate as captured in this snapshot, not a live check.

Email Security

✗

SPF Not published. Your domain can be spoofed in phishing emails.

DKIM Not detected at common selectors. Your provider may use a custom one.

✗

DMARC Not published. Receivers fall back to permissive defaults.

MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.

TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Storage (1)

Cookies (1)

Name	Lifetime	Detected as
csrftoken	12mo	-

Readiness Breakdown How?

⚠

Custom title and meta description (partial) missing meta description

✓ Responsive viewport meta tag

- Open Graph tags (title, image, description)

- Canonical URL declared

- Twitter card meta tags

- Favicon present

- Semantic HTML (nav, main, article)

Performance How?

653 ms Server response

21% Faster than peers

532 ms Largest contentful paint

0.00 Cumulative layout shift

2 KB Page weight

0 Console errors

0 Failed requests

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

AI Stance

No AI stance declared

✗ llms.txt published

✓ No AI bots blocked in robots.txt

Content-Signal

? No directive declared

Link headers

? None advertised

Well-Known Files

✗ robots.txt

✗ sitemap.xml

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

? Privacy Policy not detected

? Terms of Service not detected

Detection works best on English language sites.

Security Headers (4/6)

✓

Referrer-Policy

✓

X-Frame-Options

✗

Permissions-Policy experimental (check browser support)

✓

X-Content-Type-Options

✗

Content-Security-Policy

✓

Strict-Transport-Security

–

X-XSS-Protection deprecated (use Content-Security-Policy)

Build

0 JS files

0 CSS files

0 Third-party domains

Brand Colours

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