Check your email sending health
Find out whether your email is properly authenticated and spot content that could cause delivery or display problems.
- Create a test address.
- Send an email to it from your mailbox, website or application.
- See your results here automatically, with explanations and fixes.
Free to use. No account needed. Each address accepts one email for one hour.
Anyone with your test link can view its report. Reports expire after 24 hours.
What does the email checker check?
- Sender authentication
- SPF checks whether your server is authorized to send. DKIM checks the email’s digital signature. DMARC checks that authentication matches the sender domain your readers see.
- Sending server
- Check the connection’s encryption and the sending server’s reverse DNS identity.
- Spam signals
- See the receiving filter’s result and all matched rules with explanations and their score contributions.
- Content and signature images
- Find local image paths, embedded images that are missing, data-URL images and interactive HTML that mail apps may remove.
About Checkoutbound
Send one email to check whether your sending server is recognized, your sender identity is verified, and your message has common spam or display problems. A green result means the checks performed here passed; it does not guarantee another provider’s inbox placement.
Use Overview for the result and anything to fix. Check details shows the values observed, message parts and filter rules. Raw headers shows the message headers exactly as received. Content checks inspect the email’s structure; they do not preview every mail app or scan attachments for viruses.
Checkoutbound runs on Stalwart Mail Server. In our opinion, it’s the best choice if you want email done right. With support for modern email standards, a wealth of built-in features and straightforward configuration, it was the obvious choice for Checkoutbound.
Our sister site CheckWhois is another free tool. It checks domain registration, DNS and email routing, website hosting, and HTTPS certificates and redirects.
Our sponsors, eukhost and Webhosting UK, have been hosting email and websites since 2001. Their experienced support teams help customers resolve email problems and look after their website hosting, with real people available by phone, support ticket and live chat.