SMTP Tester Pro vs MailCheck

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

MailCheck is the ultimate SMTP diagnostic tool designed for system administrators, developers, and IT professionals. Stop guessing why your emails aren't sending. MailCheck gives you a direct look into the server conversation, helping you debug connectivity issues, verify SSL/TLS configurations, and test authentication credentials in seconds. KEY FEATURES: • Real-time SMTP Testing: Connect to any SMTP server (Gmail, Outlook, Office365, or custom servers) and verify connectivity instantly. • Raw Server Logs: View the full verbose transcript of the client-server handshake. See exactly where the error occurs (e.g., 535 Authentication Failed, Timeout, or Certificate errors). • Smart Port Configuration: Automatically toggles between SSL/TLS (465), STARTTLS (587), and Plain Text (25) based on your port selection. • Security First: Verify if your server supports modern encryption standards. • Privacy Focused: Passwords are NOT stored. All credentials are held in volatile memory (RAM) only during the session and are wiped immediately upon app termination. PERFECT FOR: - Testing new mail server setups. - Debugging firewall or port blocking issues. - Verifying "App Passwords" for third-party services. - IT Admins troubleshooting client email configurations. MailCheck is ad-free, lightweight, and built for speed. [Note: This app is a diagnostic client and does not provide an email inbox service.]