Send your sample
Send an email to your unique test address from the mailbox or sending service you want to check.
Real emails. Clearer evidence.
Check your email before your next campaign.
Send a test email to see authentication results, sending-IP reputation signals and message checks, with clear next steps.
Free testing within usage limits. No automatic charges. Explore prepaid packs.
How it works
Read the findings
See whether it arrived, which checks completed and what the available evidence supports.
Optional: compare another sample
Send another sample to the same address while your test is active. Compare the observations and record any change you made.
What you can check
- Sending connection
- the sending IP observed when your email reached Siglumo.
- Authentication
- SPF, DKIM and DMARC results recorded for your sample.
- Sending history
- available domain and IP history, with source limitations.
- Content signals
- automated analysis of the visible message body, when available.
- Comparison
- differences between two emails, without assuming a different result proves an improvement.
Evidence first
A warning is a reason to investigate, not proof that your email was rejected. An unavailable check is not a pass. A different sending IP does not, by itself, prove that a fix worked.
What this test does not measure
Siglumo observes delivery to its own receiving system. It does not measure placement in a recipient's Gmail or Outlook inbox, guarantee future delivery or certify a sender's reputation.
Before you send
Use a non-sensitive sample you are authorised to share. Test emails and reports are scheduled for deletion when the 24-hour test ends, or when you choose Delete test. Read the Privacy Policy for cleanup timing and service-provider details.
Questions before you start
Do I need to change something before the second email?
No. You can compare two sends, or test after a change. Record what changed, and check whether the two observations are comparable.
Why did my sending IP change?
Email providers may use different servers for different messages. That can limit what a comparison tells you.
Will Siglumo tell me what to rewrite?
Only when the available analysis supports a useful recommendation. A tentative content warning alone is not enough to justify a wording change.
How long can I access a test?
Your test shows its expiry time. Save any findings you need before expiry. Clearing browser data may remove your access, but does not itself delete server-held test data.
Check the sending setup you actually use.
Up to 10 tests per IP per IST clock hour, two emails per test. Shared-network and global capacity limits also apply. Maximum email size: 1024 KB.
Test my email