Software
Mailgun
A set of powerful APIs that enables your application to send, receive and track transactional emails effortlessly. Mailgun provides a global infrastructure and industry expertise that helps you get your message across to the right person at the right time. The service is trusted by over 150,000 businesses including giants like Microsoft, MIT, NHL and Lyft.
Mailjet
Mailjet is an easy-to-use all-in-one email delivery service and marketing platform. Over130,000 marketers in 150 countries use Mailjet as their primary email marketing tool. With Mailjet users can manage everything from transactional emails via the Developer API to email marketing campaigns and email template building. The interface provided by Mailjet makes it really easy to monitor your marketing campaigns, and track open-rate, link clicks and customer related metrics.
Mandrill
A transactional email platform from the email service provider MailChimp. Mandrill can be used to send transactional emails from web applications and third-party service. An API is provided by Mandrill that makes it east to integrate your application to the Mandrill platform.
Postmark
Postmark is a fast and reliable transactional email service that is trusted by thousands of developers across the globe. With Postmark, you can rest assured that your emails will arrive, on time. And if an issue was to occur Postmark provides 45 days of full content history, recipient information, and message events to help you get to the bottom issues. If that's not enough they also provide great support via email, live-chat, or 1-on-1 calls.
turboSMTP
turboSMTP is a global SMTP services that provides outgoing mail server guarantees, with secure SMTP relays. The service includes a SMTP API that can be used by application developers to integrate with their current setup. With turboSMTP your application can send emails through a trusted and authenticated SMTP relay service to ensure deliverability of your applications transactional emails. If something goes wrong you can always use the 24/7 support provided by turboSMTP, via tickets, live chat or phone.
ActiveCampaign
ActiveCampaign is an all-in-one marketing platform that gives you email marketing, marketing automation, and CRM in a unified experience. ActiveCampaign allows you to send newsletters and messages targeted to each contact’s interests to make sure that your campaign feels genuine. The CRM provides email and sales automation that is tightly integrated with your email marketing list, where you can manage pipelines and update deals on a customer basis.
Vision6
Vision6 is a email marketing platform used by businesses to grow their customer-base and connect potential buyers. The platform provides tools that allow marketers to build easily build email templates, segment their audience and follow up with real-time data for open-rate, link clicks, user location and more.
SMTP2GO
SMTP2GO is an email delivery service and technology that gets your emails sent, while robust reporting gives you a clear picture of what happens behind the scenes. SMTP2GO takes cares of blacklists, feedback loops and IP reputation so you don't have to. With real-time insightful reporting you can track every email, from sent to opened, and get your emails into inboxes.
Adium
Adium is a free and open source instant messaging client for macOS. Adium can connect to to common messaging services and networks such as AIM, XMPP (Jabber), ICQ, Google Talk, IRC and more.