Sending emails directly from your email account or from your website’s server is never a good idea. Your delivery rate will be low and if enough subscribers label your emails as spam your server’s IP address could be blacklisted.
That is why most website owners use an SMTP email service to deliver emails. SMTP delivery services, sometimes referred to as transactional emails, are affordable and ensure that your email blasts and email newsletters get delivered. They are also much more cost-effective than hosted emailing services such as Aweber.
Most self-hosted emailing applications and many WordPress newsletter WordPress plugins have an option for sending emails via a third-party SMTP email service.
On this page I have listed many SMTP relay emailing services you should check out.
 | Amazon Simple Email Service (SES)Amazon SES is a popular service that promises high deliverability, statistics, monitoring, notifications and more. Pricing costs only $0.10 per 1,000 emails that are sent and $0.12 per GB of attachments. |
 | CritsendCritsend ensures high deliverability using dynamic spam detection, block message detdector, and blacklist manager. Rates start at around $0.50 per 1,000 emails. |
 | Mail JetA good bulk emailing service that integrates with many third party apps. Their free account allows you to send 200 emails a day free. $7.49 will allow you up to 30,000 emails per month, with any additional emails costing $0.001. |
 | PostageAppAn easy to use emailing service that is aimed towards developers. HTML and CSS templates can be modified and the service shows detailed analytics. Pricing starts at $9 per month for up to 10,000 emails. |
 | PostmarkPostmark offers high delivery rates, campaign statistics, and a global infrastructure. An extensive API is provided to help you integrate the service with your own set up. Pricing starts at $1.50 per 1,000 emails, however the first 25,000 emails are provided free of charge. |
 | Send GridA bulk email service that provides real-time analytics and third-party API integration. It only costs $9.95 per month to send up to 40,000 emails. |
 | LEts you market your business using email and SMS. It offers advanced analytics, an email designer, contact management, campaign management, and high deliverability. The service integrates with many third-party services. Up to 9,000 emails can be sent every month free of charge. Their micro plan costs only $7.37 per month and lets you send up to 40,000 emails per month. |
 | SparkPostSparkPost is a versatile service that has great templating and analytics features. The service integrates with third-party services such as PayPal, Twitter, and SalesForce. A whopping 100,000 emails can be sent every month free of charge. Their pro plan allows you to send up to one million emails per month for $24.99 per month. |