Best Email APIs for Linux

Reliable SMTP relay and email delivery services. Powerful email delivery services that enable you to send and track high volume emails effortlessly. Integrate and start sending in minutes. All your transactional, email relay and email delivery needs under one roof. Whether you need a low-latency email delivery provider for your transactional emails, scalable infrastructure for high-volume sends or reliable backend solution for your marketing campaigns, SMTP is built to deliver. Reputation Defender is SMTP’s proprietary technology that uses big data to proactively monitor your email list health and safeguard your domain and IP reputation among ISPs by suppressing bad emails in your sends from hard and soft bounces. This ensures your delivery rates and inbox placement incrementally gets better over time.

EmailLabs is part of the Vercom S.A Group, which implements technology solutions in the CPaaS model. We are a cloud SMTP server infrastructure: Cloud SMTP & Email API. With years of experience in sending to the most informed senders, we can make a measurable contribution to building email reputation and improving deliverability. We take care of standardization and security of both marketing, transactional and system messages of our customers. Thanks to the in-depth knowledge of our experts, we are able to prepare the infrastructure to ensure appropriate throughput and increase the sending speed for any market and any mailbox provider. Plug EmailLabs into your transactional sends - start sending in less than 5 minutes.

Unitpost is an end-to-end customer communications platform. You describe the workflow you want (a welcome series, shipping updates, a win-back campaign, etc.) and Unitpost builds it for you: ready to run across email, text, and WhatsApp. Today we support transactional + marketing email with a hybrid template system (visual + code), contacts, segments, campaigns and automations. The foundation is built horizontally from day one: one contact model, one event system, one pricing model (shared sending balance), and every action works the same way in the UI, via API, and through our agent (Ask Unit). We are not building another email tool. We are building the messaging layer that replaces the pile of tools teams currently stitch together and can be prompted for result, not manually built.