Test any SMTP server from your iPhone or iPad. Enter the server, pick the encryption and login method, send a real test email, and see the complete SMTP conversation in a color-coded transaction log. SMTP Tester Pro is built for IT admins, developers and email administrators who need to know why mail isn't going out.
Connection and security:
- TLS modes: Require STARTTLS (port 587), Require TLS (SSL/TLS, port 465), Normal and Ignore TLS
- Login methods: LOGIN, PLAIN, CRAM-MD5 and XOAUTH2, or no login for relays and test servers
- Self-signed certificates and custom OpenSSL cipher suites
- Adjustable timeout
Real test emails:
- To, CC and BCC with comma-separated addresses
- HTML body with a built-in template and a plain-text fallback
- File attachments from the Files app
- Custom headers such as Reply-To or X-Priority
Transaction log:
- Every command and server reply, color-coded, with a color legend
- Successful and failed sends are saved in the log, grouped by day
- Search a log, show or hide timestamps, copy or share it
- Clear error messages with the server's own reply and troubleshooting tips
Templates:
- Server settings for Microsoft 365, Gmail, Outlook.com, iCloud Mail, Yahoo Mail, AOL Mail, Zoho Mail, GMX Mail, Yandex Mail and Mail.com
- Save your own servers as templates, stored encrypted on your device
- Password-protected backup and restore of your templates
Privacy and appearance:
- Face ID lock and password visibility settings
- Passwords and access tokens are never written to the log
- Light, Dark and System appearance, adjustable log font size and colors
- Works on iPhone and iPad
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