This is our most helpful tool, which allows debugging a real SMTP session between your software (CMS, CRM, custom website) and an SMTP provider (Mailgun, Sendgrid, Gmail, UniOne, etc.).
You should copy your current SMTP settings (host, port, and username) to the form below and replace them in your software/website config with these:
Unregistered users are limited to 10 test sessions per hour, while registered users can have up to 30 sessions per hour.
Please remember to store your original credentials in a safe place before changing them!