Great for

• Build marketing or transactional emails
• The platform offers advanced email analytics features so you can measure the success of your campaigns
• Create and customize email sign up widgets to sit on your website
• If you send over 500,000 emails a month Sender can allocate you a dedicated IP address
• Create web push notifications with Sender

Be aware that

• Free tier is limited to 15,000 emails per month or 2,500 subscribers