Mailjet

Another SMTP relay service that any marketer, business, organization, website owner can use for sending transactional emails in bulk. This SMTP Service provides fast email delivery with an easy integration process and affordable price.

With Mailjet tracking features, you can track how many recipients opened emails, how many recipients unsubscribed you, and how many recipients unopened your emails and more, these metrics will help you to improve your marketing campaign.

Pricing-

• Free Plan: This SMTP service also offers forever free plan which lets you send 6,000 emails/month and 200 emails a day.
• Paid Plan: It starts from $8.69 and for the highest plan, you have to contact their sales team.