Pre-send QA for marketing email
Send a test.
Catch the disaster.
Fix it in minutes.
SendGuard scans your campaign like a paranoid email lead — broken links, bad merge tags, missing unsubscribe, auth issues and more — in under 60 seconds.
No signup. Send a test email, see your report.
Used on campaigns from Klaviyo, Mailchimp, HubSpot & more
Typical result: 2–7 issues found in first scan
Black Friday – VIP offer
Campaign preview
Broken checkout link
"/checkout?bf2025" → 404
Missing unsubscribe
Required in promotional emails
SPF/DKIM/DMARC
All good
Try it on a real campaign
Takes 60 seconds
- 1
Add your workspace email as a test recipient
Copy the address from the right and add it to your test recipients list.
- 2
Hit "Send test" from Klaviyo, Mailchimp, or wherever
Works with any ESP — no integration needed.
- 3
Get a report you can actually fix from
Clear issues, actionable fixes, no fluff.
Test Your Next Campaign, Fast
Send from your ESP, or forward as attachment.
- Results in ~60 seconds
- No account needed
- 18 professional checks
- Works with any ESP
Works with Mailchimp, Klaviyo, HubSpot, Brevo, and any ESP
See the real interface
What you'll see after every scan
Clean, actionable results. No noise, just the issues that matter and exactly how to fix them.
One email, two timelines
Which future do you want?
Before SendGuard
Campaign goes out to 120,000 subscribers
Support tickets: "Your link is broken"
Black Friday slot ruined
Lost revenue from one broken link
$50,000
With SendGuard
Test campaign sent to SendGuard
"Broken checkout link" flagged as critical
Link fixed, new test passes, campaign scheduled
SendGuard cost for the year
< 1% of that campaign
What SendGuard actually checks
We check what keeps you up at night
The engine runs 18+ checks. You'll mostly remember the 2–3 that just saved you.
Revenue-killing issues
- Broken checkout / landing links
- Wrong promo code
- UTM parameters missing / corrupted
Brand & embarrassment
- "Hi {{FirstName}}" merge tags
- Personalisation fields missing or misconfigured
- Off-brand preheaders / subject line issues
Compliance & reputation
- Missing unsubscribe / physical address
- Reply-to points to a dead inbox
- Auth misconfigured (SPF/DKIM/DMARC)
Deliverability & UX
- Heavy images / bad text-to-image ratio
- Broken tracking pixels / weird redirect chains
- Dark mode and accessibility warnings
View all 18+ checks
Additional checks included
- Image optimization & alt text validation
- Subject line spam trigger analysis
- HTML structure validation
- Mobile responsiveness preview
- Dark mode rendering check
- Accessibility compliance
- Load time analysis
- Text-to-image ratio
- Preheader text optimization
- Footer compliance check
- Reply-to address validation
- Tracking pixel integrity
- Redirect chain analysis
More than just checks
Built for how you actually work
Powerful features that fit into your existing workflow, not the other way around.
See exactly where the issue is
Issues are highlighted directly on your email preview. No hunting through logs or deciphering error codes.
Send from ESP or forward as attachment
Works with any ESP via our integration. Or forward emails as attachments to test historic campaigns and templates.
Manage all your brands
Separate workspaces for each client or brand. Perfect for agencies.
Check every campaign, every time
Unlimited scans on all paid plans. Never skip a pre-send check.
Enterprise ready
Built for organizations that need security, compliance, and dedicated support at scale.
Where it fits
Fits into the 10 minutes before you hit 'Send'
Prepare campaign
Design email in Klaviyo, Mailchimp, HubSpot… as usual.
SendGuard check
Add your workspace address as a test recipient. Send test campaign. Fix what SendGuard finds.
Schedule & send
Ship your campaign, sleep better that night.
No code, no integration, no DNS changes.
If you can send a test email, you can use SendGuard.
"SendGuard caught a broken checkout link that would have cost us $50K on Black Friday. It paid for itself hundreds of times over in one save."
Sarah Chen
Head of Email Marketing
What people see in their first scan
3.2 issues found
Avg. first scan
>70%
First-time users with critical issues
8 minutes
Median time-to-fix
Key insight: Most issues are simple to fix once you know about them. The hard part is finding them before your subscribers do.
Works with campaigns from
Simple pricing
One save pays for the year
If a single broken campaign costs you even £5k in lost revenue, you'd have to try very hard to make SendGuard not worth it.
FAQ
Common questions, straight answers
-
No. SendGuard works by receiving test emails. You simply add a SendGuard email address as a test recipient in your ESP — no integrations, API keys, or account access required.
-
SendGuard only receives your test emails — we never send emails to your subscribers or interact with your sending domain. Your deliverability metrics won't be affected.
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We store the content of your test emails for analysis and your check history. We never share or sell your data, and you can delete your check history at any time.
-
Adding SendGuard takes about 30 seconds — add an email address as a test recipient. Scans complete in under 60 seconds. Most teams say it saves time by catching issues before they become fires to put out.
-
Absolutely. Generate a test address right now, send a test email, and see your results — no signup required. When you want unlimited scans, sign up for a paid plan instantly.
Do you need access to our ESP account?
Will this affect our deliverability?
What data do you store?
Will this slow our team down?
Can I try it without talking to sales?
Send your next big campaign through SendGuard first.
You'll either fix something important, or sleep even better knowing there was nothing to fix.