Email tester
Test your email authentication by sending an email to the address below.
Waiting for email...
Test your email authentication with a real message
Live message test
Send an email to a unique test address to inspect SPF, DKIM, DMARC alignment, blocklists, reverse DNS, TLS, and unsubscribe headers from the message receivers see. For ongoing visibility, use Suped's DMARC monitoring to track authentication results, sender changes and delivery issues over time. For DNS focused checks, use the domain health checker, SPF checker, or DKIM checker. For ongoing reputation, pair message tests with blocklist monitoring.
Get started
One email tester, endless uses
Use the email tester before a launch, after changing DNS, while debugging deliverability, or when a provider says authentication is fixed. It checks the real message path, not just DNS, so you can see whether SPF, DKIM and DMARC passed, whether domains aligned, whether the sender is listed, and whether headers meet mailbox provider expectations.
Send test email
tester+a1b2@inbound.suped.com
Real message capture
Send an email to a unique address and inspect the message that actually arrived.
DMARC aligned
SPF passed
DKIM signed
Authentication alignment
Check SPF, DKIM and DMARC pass results against the visible From domain.
Sending IPclear
From domainclear
Return pathclear
Blocklist coverage
Check the sending IP, From domain, return path and HELO domain against blocklists.
Reverse DNS
mail.example.com
HELO matches PTR
Reverse DNS and HELO
Confirm the sending IP has PTR records and the SMTP hostname matches.
TLS encryption used
TLS 1.3
Transport encryption
See whether the message used TLS and whether the negotiated version is modern.
List-Unsubscribe
One-click
Visible link
Unsubscribe compliance
Inspect one-click unsubscribe, mailto fallback and visible unsubscribe links.
Email tester FAQs
Answers to common questions about sending a test email, reading the report, and deciding what to fix next.
No. It receives a test message, inspects the headers and related DNS records, then reports what happened.
It gives you a unique address. Send an email to that address, then the report checks the delivered message, authentication results, DNS records, sending IP, blocklists, reverse DNS, TLS and unsubscribe headers.
DNS checks show what is published. A real email test shows what your sending provider actually used, which IP delivered the message, which DKIM selector signed it, and whether SPF, DKIM and DMARC aligned.
The tester checks the domain's DMARC record, policy, reporting setup, external reporting authorization, and whether the received message passed DMARC.
The tester checks the SPF record for the return path domain, lookup limits, include issues, unsafe mechanisms, whether SPF passed for the sending IP, and whether SPF aligned with the From domain.
The tester checks DKIM selectors found on the message, validates their DNS records, checks key quality, reports whether signatures passed, and shows whether a passing signature aligned with the From domain.
The tester checks the sending IP, visible From domain, return path domain and HELO domain against email blocklists that can affect acceptance or spam placement.
The tester checks whether the sending IP has a PTR record and whether the HELO or EHLO hostname matches that reverse DNS hostname.
The tester checks whether the SMTP connection used TLS, whether the negotiated TLS version is modern enough, such as TLS 1.2 or TLS 1.3, and whether the TLS cipher suite is secure.
For marketing email, the tester checks for List-Unsubscribe, one-click unsubscribe support, a mailto fallback, and a visible unsubscribe link in the message body.
Yes. After a test message arrives, use the share link to send the same report to a teammate, client, or provider.
The email tester is best for checking a specific message. For ongoing visibility into DMARC, SPF, DKIM alignment and sender behavior, use DMARC monitoring.
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Start monitoring your DMARC reports today
What you'll get with Suped
Real-time DMARC report monitoring and analysis
Automated alerts for authentication failures
Clear recommendations to improve email deliverability
Protection against phishing and domain spoofing