SMTP Tester Pro: Email Test

Mail Server & STARTTLS Check

USD 3.99 · Designed for iPad. Not verified for macOS.

Send a real test email to any SMTP server and see every command and reply in a colour-coded log. STARTTLS, SSL/TLS, XOAUTH2 and more. 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 colour-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, colour-coded, with a colour 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 colours - Works on iPhone and iPad

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SMTP Tester Pro 1.7.1 fixes connections to mail servers that send their capabilities in several parts. These servers no longer fail with "STARTTLS was required but the server did not issue a STARTTLS command", and their login methods are detected correctly.

The developer, Dorian Borovina, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Larger Text

      • Dark Interface

      • Sufficient Contrast

      • Reduced Motion

    Provider
    Dorian Borovina
    Size
    4 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 16.6 or later.
    • iPhone
      Requires iOS 16.6 or later.
    • iPad
      Requires iPadOS 16.6 or later.
    • Mac
      Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2025 Dorian Borovina. All Rights Reserved