Mailjet - All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Litmus - litmus tests and tracks your email campaigns, so you can always put your best design forward.
PHPMailer - Email sending library for PHP.
250ok - 250ok offers a SaaS-based platform to monitor and measure the deliverability of email networks.
SendFox - Create automated newsletter campaigns with an affordable email marketing solution