Mailjet - All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.
Cirrus Insight - Respond to Customers Faster and Update Salesforce from Your Inbox with Cirrus Insight. Start your free 14-Day trial today! No Credit Card Required.
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.
Woodpecker - Legal document automation for solo & small firms. Simple to use, works in Word, connects to everything.
PHPMailer - Email sending library for PHP.
Close - A CRM with built-in calling, SMS, and email