Check Your Email Before You Send
Check your email for authentication, content, HTML, link and delivery risks before your next campaign. Everything runs locally in your browser.
Sender Information
Email Content
A plain-text version improves compatibility and signals good sending etiquette.
No data is uploaded — the check runs entirely in your browser.
Paste your sender information and email HTML above, then click Check Deliverability.
What Is Email Deliverability?
Email deliverability is the measure of whether your message actually reaches the recipient's inbox rather than being bounced, deferred or filtered into spam. It is a chain of events: your server submits the message, the recipient server accepts it, authentication and policy checks run, and finally the message is either delivered, rejected or filtered.
Sending an email is not the same as getting delivered, and getting delivered is not the same as reaching the inbox. Full deliverability is an outcome determined by reputation, authentication, content and recipient engagement — not by any single setting.
How Email Deliverability Works
- The sender submits the message to its SMTP server.
- The SMTP server processes it and routes it to the recipient's mail server.
- The recipient server receives it and runs authentication and policy checks.
- Authentication checks run — SPF, DKIM and DMARC verify the sender.
- The message is delivered, deferred, rejected or filtered based on reputation and content.
SPF, DKIM & DMARC
This tool does not perform live DNS lookups. To check your actual SPF, DKIM and DMARC records, use the dedicated authentication checker.
Why Emails Bounce
- Invalid addresses — the mailbox or domain does not exist.
- Full mailboxes — the recipient cannot accept more mail.
- Temporary server failures — busy or overloaded servers.
- Policy rejection — spam or security filtering.
- Authentication problems — failed SPF, DKIM or DMARC.
- Reputation issues — the sender or IP is blocked or has poor reputation.
How to Improve Email Deliverability
- Authenticate everything. Publish valid SPF, DKIM and DMARC records.
- Keep your list clean. Remove hard bounces and stale addresses promptly.
- Send relevant, consistent content that matches what subscribers expect.
- Respect unsubscribes and honor complaint feedback.
- Monitor bounce and complaint rates and react quickly to spikes.
Frequently asked questions
Does This Tool Guarantee Inbox Placement?
No. Inbox placement depends on many factors including recipient-provider filtering, sender reputation, authentication, engagement, complaints, infrastructure and message content. This checker identifies likely risk areas based on deterministic, client-side analysis. For the definitive answer, send a real test email to inboxes across providers.