Does the email tester change my DNS or email setup?

No. It receives a test message, inspects the headers and related DNS records, then reports what happened.

How does the email tester work?

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.

What if my test email does not arrive?

Confirm you copied the current test address and check your provider's sent-mail, queue, bounce or SMTP logs. Keep the page open while waiting. If sending fails before the message reaches Suped, there is no received message for the tester to inspect.

Why test a real email instead of only checking DNS?

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.

What DMARC checks are included?

The tester checks the domain's DMARC record, policy, reporting setup, external reporting authorization, and whether the received message passed DMARC.

What SPF checks are included?

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.

What DKIM checks are included?

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.

What blocklist checks are included?

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.

What reverse DNS checks are included?

The tester checks whether the sending IP has a PTR record and whether the HELO or EHLO hostname matches that reverse DNS hostname.

What encryption checks are included?

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.

What unsubscribe checks are included?

The tester looks for List-Unsubscribe, a one-click header marker, a mailto option and an unsubscribe-link pattern in the HTML body. It does not submit unsubscribe requests or certify complete compliance. Interpret these checks in the context of marketing mail, not every transactional message.

Does passing every check guarantee my email reaches the inbox?

No. The score summarizes this report's technical checks, not an inbox-placement probability. Suped does not run a multi-provider seed test or a spam-content scoring engine, and mailbox providers use additional private reputation and filtering signals.

Can I share an email tester report?

Yes. After a message arrives, use the share link to send the report to a teammate or provider. Anyone with the report link can view its message details, so use a non-sensitive test email and do not include credentials or confidential content.

How do I monitor results over time?

The email tester is best for checking a specific message. For ongoing visibility into DMARC, SPF, DKIM alignment and sender behavior, use DMARC monitoring.

Free Email Deliverability Test & Email Tester

Find deliverability issues that can send emails to spam

Live message test

Send a real message to this free email tester tool using your normal provider. Find issues that can contribute to spam filtering across authentication, blocklists, reverse DNS, TLS and unsubscribe headers. 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

"This clarity allows us to take action faster whether it's adjusting content, fixing authentication, or addressing reputation issues. We've moved from reactive guesswork to proactive management."

John Porteous

Group IT Manager

How to use the free mail tester: send a test email

Copy the unique address, send a non-sensitive message through your normal provider without forwarding, and keep the page open. Suped receives the test; it does not send for you.

Email deliverability test: what your report checks

Review SPF, DKIM and DMARC alignment, blocklists, reverse DNS and SMTP TLS. Marketing-mail unsubscribe checks inspect headers and link patterns, not endpoint behavior or full compliance.

Compare the message with your published authentication DNS.

Can an email spam test predict inbox placement?

Use the report to fix authentication, blocklist and sending-setup issues that can contribute to spam filtering. Inbox placement also depends on reputation, engagement and each receiver's filters; this is not a multi-provider inbox test.

Monitor authentication across your sending traffic.

Real-message email deliverability checks

Check the sending IP, DKIM selector and authenticated domains that your provider actually used. Use the report to fix configuration and reputation issues that can contribute to spam filtering.

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