SMTP

Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.

Open Source

All-in-one email service provider that provides maximum insight and deliverability results for both marketing and transactional emails.

Learn why more developers choose SendGrid for their email deliverability service to send transactional emails triggered by web apps. Get started for free

Postmark is the easiest and most reliable way to be sure your important transactional emails get to the inbox. Simply & reliably parse recieved email to JSON for your webapp.

Open Source

Use our powerful Email APIs to deliver all your business critical emails on time and to the Inbox. We are the world’s only ESP that gives cashback on emails opened.

CMail is a free Windows command line mailer with advanced message formatting options.

free

Mandrill is a new way for apps to send transactional email. It runs on the delivery infrastructure that powers MailChimp.

MailChimp is the best way to design, send, and share email newsletters.

The World’s Most Affordable Email Infrastructure For Business

paid $35.0 / One-off

Blat is a small, efficent SMTP command line mailer for Windows.

mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.

Deliver your app and website emails on time and to the inbox. Trusted to send 25% of the world's non-spam email. Email delivery for companies big and small.

Open Source

CheFSendeR is a simple command line tool to send emails.

free