SMTP Tester Pro vs ReqPad

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

ReqPad is the API client that Postman should have built for mobile. Test REST, WebSocket, GraphQL, gRPC, MQTT, Socket.IO and MCP — with built-in AI — all from your iPhone, iPad, or Mac. No laptop. No desktop app. No compromises. — WHY DEVELOPERS SWITCH TO REQPAD: You're on the train and staging is down. You're in a meeting and someone asks "is that endpoint returning the right schema?" You're in bed at midnight and a webhook isn't firing. With ReqPad, the answer is always the same: open your phone, test it, fix it, move on. — 7 PROTOCOLS, ONE APP: Most mobile API tools only handle REST. ReqPad handles seven: • REST/HTTP — every method with full header, body, and auth control, plus Server-Sent Events streamed live; Send as a Browser for sites that only answer browsers • WebSocket — Real-time bidirectional messaging with live connection status • GraphQL — Query editor with syntax highlighting, variables, and subscription support • gRPC — Server reflection and .proto file support • MQTT — Connect to IoT brokers with QoS levels and topic subscriptions • Socket.IO — Test event-driven real-time communication • MCP — Connect to Model Context Protocol servers: call tools, read resources, run prompts ReqPad is the only mobile API client with gRPC and Socket.IO support. — REQPAD AI — AN API EXPERT ON EVERY SCREEN: • Explain any failure — a 4xx, a GraphQL error, a refused WebSocket or a gRPC status — with the cause and a one-tap fix • Describe a request in plain words — ReqPad AI fills in the method, URL, headers and body • Write messages and queries — GraphQL from your schema, WebSocket, Socket.IO and MQTT messages, gRPC messages from the proto, MCP tool arguments • Write tests for the response you just got • Ask the JSON a question — get a JSONPath filter You see exactly what is sent before it is sent, and secrets are removed on your device first. — SCRIPTS & AUTOMATION: • Pre-request and test scripts with the Postman-compatible pm.* API • Collection Runner — run whole collections with CSV/JSON data files and a report • OAuth 2.0 flows with automatic token refresh • Secret variables kept in secure storage • JSON tree view with JSONPath filtering — ENTERPRISE AUTHENTICATION BUILT IN: Don't hack together auth headers manually. ReqPad supports: • Bearer Token & JWT • OAuth 1.0 & 2.0 (full flow) • Basic & Digest Authentication • API Key — header, query param, or cookie • AWS Signature v4 • Hawk Authentication • Akamai EdgeGrid — GENERATE CODE IN 20+ LANGUAGES: Build your request visually, then export it as production-ready code: Swift, Kotlin, Python, JavaScript, Go, Rust, PHP, Ruby, C#, Java, Dart, cURL, and more. — IMPORT EVERYTHING, START IN SECONDS: • Postman Cloud Sync — Import your existing workspaces in one tap • cURL Import — Paste a cURL command and ReqPad builds the request • OpenAPI / Swagger — Import full API specs • HAR Files — Import browser network recordings • APIs.guru Directory — Browse and test 2,500+ public APIs instantly Already invested in Postman? You don't have to start over. Bring your work with you. — ORGANIZE LIKE A PRO: • Collections — Group requests into folders by project, team, or API • Environments — One tap to switch between dev, staging, and production • Variables — Use {{dynamic_variables}} in URLs, headers, and request bodies • History — Every request saved and searchable • Cookie Manager — Full visibility and control over stored cookies — YOUR DATA STAYS YOURS: ReqPad is privacy-first. Your API keys, tokens, and request data live on your device. We don't track your requests, log your endpoints, or store your credentials on our servers. ReqPad AI is optional and sends only what an action needs, after you see it. — Free to start. No account required. Just open and test. Questions or feature requests? We actually read every email: support@reqpad.app Terms of Use: https://reqpad.app/terms Privacy Policy: https://reqpad.app/privacy