Real-Time Authentication Diagnostics
Securely verify your SMTP credentials in real-time. We establish a live, encrypted STARTTLS or SSL connection to execute the AUTH LOGIN sequence, instantly detecting missing App Passwords, Office 365 tenant restrictions, and credential failures without ever sending a test email.
Validate your SMTP username and password securely. We detect if your login is failing due to incorrect credentials, missing App Passwords (MFA blocks), or tenant-level SMTP AUTH restrictions on Google Workspace and Office 365.
A correct password is no longer enough to send an email. Modern mail providers block legacy authentication to protect against botnets. Understand exactly why your app is failing to connect.
5.7.139) to notify you to enable it in the admin center.STARTTLS or Implicit SSL connection before transmitting any credentials, ensuring your passwords are never sent in plaintext.AUTH LOGIN command and immediately issues a QUIT upon receiving a success code, ensuring no actual emails are sent or queues triggered.Your feedback has been submitted successfully. We appreciate your help in improving our tools.