Deep SMTP Diagnostic Probe
Connect directly to your Mail Transfer Agent (MTA). We will perform an EHLO handshake to extract and profile all supported capabilities (Extensions) such as PIPELINING, SMTPUTF8, and maximum message SIZE limits.
SMTP Diagnostic Tools
Optimize your email sending behavior with absolute precision. Execute a live EHLO handshake to strictly profile MTA capabilities, extract precise SIZE limits, detect PIPELINING for bulk delivery speed, and verify SMTPUTF8/8BITMIME readiness using real-time TCP socket connections and absolutely zero simulated data.
Connect directly to your Mail Transfer Agent (MTA). We will perform an EHLO handshake to extract and profile all supported capabilities (Extensions) such as PIPELINING, SMTPUTF8, and maximum message SIZE limits.
Not all SMTP servers are created equal. Knowing exactly which extensions your server supports allows you to optimize your application's email sending behavior.
SIZE extension explicitly tells the client the maximum message size (in bytes) the server will accept.8BITMIME require all email bodies to be encoded into 7-bit formats (like Quoted-Printable). We check if your server supports modern encoding.Your feedback has been submitted successfully. We appreciate your help in improving our tools.