A complete learning curve how SMTP Protocol works, detects errors and SSL Certificate. A Complete mailing error troubleshoot.
Enter mail server's hostname or mail address to Lookup
We will run a various test against the server, showing realtime output, how SMTP connection looks like.
In the output we query DNS informations and doing ISP Lookup too.
What is the better way to learn how SMTP works and what is the commincation between server and client than see it online!
Dual-Mode meanwhile we test your SMTP also go for test against the most common blacklists.
If the mail server supports any kind of TLS/SSL we will provide certificate info as well.