Best Email APIs for Gmail

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Reliable SMTP relay services and email delivery services. You can send and track large volumes of emails with ease using powerful email delivery services. In minutes, integrate and you can start sending. All your email delivery, transactional and email relay needs are covered under one roof. SMTP can deliver whether you need a reliable backend solution or scalable infrastructure to handle large volumes of emails. Reputation Defender, SMTP's proprietary technology, uses big data to proactively monitor and protect your email list health. It also suppresses bad emails from soft and hard bounces in order to protect your IP reputation and domain. This will ensure that your delivery rates and inbox placement gradually improve over time.

Reply.io is an AI-powered sales engagement platform that streamlines cold outreach with multiple mailboxes, turns website visitors into booked meetings with AI Chat, and optimizes your sales process with AI SDRs—covering everything from building lead lists to creating personalized sequences. Trusted by over 3,000 businesses and recognized among G2’s Top 50 Sales Products for 2024, Reply offers: - Cold Outreach Tools: Connect with prospects via emails, LinkedIn, WhatsApp, SMS, calls, and more - all combined in dynamic, conditional branch sequences. - AI SDR Agents: Automate sales outreach to increase meeting bookings. - Reply AI Chat: Engage website visitors and convert them into leads with AI-driven chat and video avatars. - Email Deliverability Suite: Ensure high email deliverability rates with comprehensive email health tools and Mailtoaster.ai. - Agency Growth Hub: Custom solutions for sales and lead generation agencies, featuring integrations, an agency dashboard, and a sales experts marketplace. Reply.io is ideal for small businesses, medium businesses, startups, agencies, and enterprises alike.

Capture SMTP traffic in staging and dev environments. Flexible API allows you to automate test scenarios and flow. Validate HTML/CSS and analyze email content for spam scores. Each Mailtrap account comes equipped with a unique testing environment. It takes just a few steps to integrate it with your app. You can create individual inboxes to support different environments, review servers, and then group them into the appropriate projects. Our API is easy to use and allows you to quickly set up automated testing using unlimited API calls. View messages, check spam scores and validate headers. You can also analyze the HTML support across all email clients. Access your inboxes to clients or colleagues. Send selected test email to whitelisted recipients. Mailtrap can be sent directly from your CRM or email send service. Simulate sending emails to multiple recipients.