SMTP or Simple Mail Transfer Protocol is an application layer protocol that is used for sending emails from one email account to another through the internet.
A client that is sending an email establishes a TCP connection to the SMTP server and then sends an email through the established connection. There are hundreds of options when choosing an SMTP service provider, and we will list some of the best and free options available online.
1. Google
One of the most popular options in the past few years has been Google’s free SMTP server. All you need to access this service is a Gmail account. It is pretty reliable and simple to use. In the free plan, Google provides 500 emails per rolling 24 hours.
Key features include great email deliverability and the option to send messages from a different email address and receive emails to your Gmail account. If you have a business email address, you can add it as a custom domain name and send bulk emails through Gmail.
2. SendGrid
Aside from being a marketing automation platform, SendGrid offers a free SMTP server functionality. It provides users with a secure and reliable transfer of transactional messages through the global network. SendGrid also has a powerful delivery optimization tool and suppression management.
The free version offers 100 emails per day. The offered Email API lets you integrate and deliver in minutes with their RESTful APIs and SMTP libraries that support languages like node.js, ruby, python, go, PHP, java, and c#.
3. Mailgun
Mailgun is an SMTP service that helps you send automated transactional emails while tracking deliverability. It is easily integrable with any WordPress site with a wide range of features.
Users get access to address validation tools, inbox placement, and detailed documentation. This is one of few services that is developer-oriented, thus not being always beginner friendly. The free plan lasts a month, and you can send up to 5000 free emails in that period.
4. SMTP2GO
SMTP2GO is a free SMTP relay service that allows you to send emails, track them, and achieve a high deliverability rate. The service employs an efficient network with built-in redundancy to handle traffic and ensure that your emails are sent even if the internet goes down.
The free plan allows users to send 1000 emails per month and get five days of premium email reporting. Key features include actionable real-time analytics
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This article was written by Muhamed Delihasanovic and originally published on WP Newsify.