5 Best WordPress SMTP Plugins to Maximize Email Deliverability

Email remains a cornerstone for businesses and individuals alike. Whether you’re running a blog, an e-commerce platform, or a corporate website, ensuring that your emails reach their intended recipients is paramount. One key factor in achieving optimal email deliverability is utilizing a reliable SMTP (Simple Mail Transfer Protocol) service. Fortunately, WordPress users have access to a plethora of plugins designed to enhance their email delivery capabilities.

In this blog post, we’ll explore the top 5 WordPress SMTP plugins that can significantly boost your email deliverability. These WordPress plugins go beyond the default email settings in WordPress, offering advanced features, customization options, and seamless integration with popular email services. From enhancing the security of your outgoing emails to providing detailed logs and analytics, each plugin on our list has its unique strengths.

We’ll delve into the features, and  benefits, helping you make an informed decision based on your specific needs. So, let’s start the exploration of the 5 best WordPress SMTP plugins, and take the first step towards ensuring that your emails not only reach their destination but also make a lasting impact.

What is SMTP (Simple Mail Transfer Protocol)?

The backbone of electronic communication, SMTP, or Simple Mail Transfer Protocol, is a fundamental protocol governing the transmission of emails across the internet. As an integral part of the email ecosystem, SMTP ensures the reliable delivery of messages from sender to recipient, playing a pivotal role in the seamless exchange of electronic mail.

SMTP operates within the application layer of the Internet Protocol (IP) suite, providing a set of rules and conventions for the transfer of emails between servers. Its primary purpose is to handle the outgoing mail flow, transferring messages from the sender’s mail server to the recipient’s mail server. Think of SMTP as the postal service for the digital realm, defining how messages are packaged, addressed, and sent on their journey through the vast expanse of the internet.

How SMTP Works

Understanding how SMTP operates requires a glimpse into the intricate choreography of e-mail delivery. The process begins when a user initiates the creation of an email on their device. This email is then transmitted to the sender’s mail server, the entity responsible for processing outgoing messages.

Upon reaching the sender’s mail server, the email is prepared for its digital expedition. SMTP takes the reins at this juncture, encapsulating the message in a standardized format and adding essential metadata, including the sender’s and recipient’s email addresses. This formatted email is then dispatched to the destination mail server, beginning its journey across the internet.

SMTP relies on a client-server model, with the client being the sender’s mail server and the server being the recipient’s mail server. When the sender’s mail server initiates contact with the recipient’s mail server, they engage in a series of handshakes and negotiations to establish a secure and reliable connection. These negotiations include verifying the identity of the sender’s server and ensuring that the recipient’s server is ready to receive the incoming message.

Once the connection is established, the actual transfer of the email takes place. The sender’s server communicates with the recipient’s server, conveying the packaged email along with the pertinent metadata. The recipient’s server then verifies the recipient’s address, accepting the email into its care. This meticulous process ensures that the email is not only delivered but also accurately routed to the intended recipient.

SMTP’s commitment to reliability extends beyond the moment of transmission. It incorporates a series of status codes, indicating the outcome of each step in the delivery process. These codes, such as 250 for successful delivery or 550 for a permanent failure, enable servers to communicate and troubleshoot potential issues, ensuring that undeliverable emails are promptly identified and addressed.

SMTP’s functionality extends beyond the straightforward transfer of messages. It accommodates attachments, allowing multimedia files, documents, or images to be appended to emails. SMTP also supports various authentication mechanisms, enhancing the security of email transmission by verifying the legitimacy of the sender’s server.

Security is further bolstered by supplementary protocols like TLS (Transport Layer Security), which encrypts the communication between servers, shielding the contents of emails from potential eavesdroppers. This emphasis on security is paramount in an era where privacy concerns and cybersecurity threats loom large.

SMTP’s role doesn’t conclude with the successful transmission of messages. It oversees the intricacies of email routing, working in tandem with other protocols such as DNS (Domain Name System) to resolve domain names and locate the appropriate mail servers. This collaborative effort ensures that emails navigate the digital landscape accurately, reaching their intended destinations without detours or delays.

SMTP operates quietly behind the scenes, a digital maestro orchestrating the harmonious exchange of emails across the vast internet. Its reliability, security features, and adherence to standardized protocols have cemented SMTP as an indispensable component of the global communication infrastructure, shaping the way we connect and communicate in the digital age. Let’s go through some benefits of it.

Benefits of SMTP

We have seen that SMTP (Simple Mail Transfer Protocol) is a foundational element of email communication, playing a crucial role in ensuring the smooth and reliable delivery of messages across the internet. Its benefits extend beyond just facilitating the sending of emails; they encompass efficiency, security, and the overall enhancement of electronic communication. Let’s delve into the various advantages that SMTP brings to the table:

  • Reliable Email Delivery: SMTP’s primary function is to reliably transmit emails from the sender’s mail server to the recipient’s mail server. Its robust and standardized approach ensures that emails reach their intended destinations efficiently, fostering a dependable communication channel.
  • Efficient Communication: SMTP streamlines the process of sending and receiving emails, providing a quick and efficient means of communication. By defining a set of rules and protocols, SMTP minimizes delays and errors, allowing users to send messages with confidence, knowing that they will reach their recipients promptly.
  • Attachment Support: SMTP supports the attachment of files to emails, allowing users to send not only text but also multimedia content, documents, and images. This feature enhances the versatility of email communication, making it a comprehensive tool for sharing information in various formats.
  • Standardized Protocols: SMTP operates on standardized protocols, ensuring interoperability among different email systems and servers. This standardization facilitates seamless communication between diverse email platforms, regardless of the underlying technologies or service providers.
  • Error Handling and Status Codes: SMTP incorporates a system of status codes, enabling servers to communicate the outcome of email delivery attempts. Status codes such as 250 (for successful delivery) or 550 (for permanent failure) help identify and address issues promptly, contributing to the overall reliability of email transmission.
  • Security Features: SMTP prioritizes security in email communication. It supports authentication mechanisms that verify the legitimacy of the sender’s server, preventing unauthorized entities from sending emails on behalf of others. Additionally, the integration of TLS (Transport Layer Security) encrypts the communication between servers, safeguarding the contents of emails from potential eavesdroppers.
  • Flexible Configuration: SMTP allows for flexible configuration to meet the specific needs of users and organizations. Users can customize WordPress settings such as the mail server address, port number, and authentication methods, enabling them to adapt SMTP to their unique requirements and infrastructure.
  • Compatibility with Other Protocols: SMTP seamlessly integrates with other protocols, enhancing the overall functionality of email systems. It collaborates with protocols like DNS (Domain Name System) to resolve domain names and locate mail servers, ensuring accurate email routing across the internet.
  • Diagnostic Tools and Logging: SMTP provides diagnostic tools and logging features that allow administrators to monitor and troubleshoot email delivery. Detailed logs help identify issues, track the status of emails, and facilitate efficient debugging, contributing to the overall health and performance of the email system.
  • Global Communication Standard: SMTP has become a global communication standard, forming the backbone of email services across the internet. Its widespread adoption ensures a consistent and reliable experience for users worldwide, regardless of their location or the email service they use.

Overall, SMTP’s benefits are multifaceted, encompassing reliability, efficiency, security, and adaptability. 

5 Best WordPress SMTP Plugins

WordPress SMTP plugins have become indispensable tools for website administrators seeking to enhance the reliability, security, and customization of their email communication. These plugins streamline the process of setting up and configuring SMTP (Simple Mail Transfer Protocol) for WordPress websites, offering an array of features that contribute to a more professional and efficient email system. Let’s delve into the features and other details of the 5 best WordPress SMTP plugins, each designed to cater to the diverse needs of WordPress users.

WP Mail SMTP by WPForms

WP Mail SMTP by WPForms stands out as a powerhouse amongst WordPress SMTP plugins, boasting an impressive 3+ million active installations. Developed by the WPForms team, this plugin excels in simplifying SMTP configuration and offers a rich set of features to enhance email deliverability and security. Seamlessly integrating with leading email services such as Gmail, Outlook, and SendGrid, WP Mail SMTP ensures reliable email transmission, making it an essential tool for website administrators. The user-friendly setup wizard within the WordPress dashboard adds to its appeal, guiding users through the configuration process effortlessly. This Plugin is also the most reliable plugin when designing an engaging  Elementor Contact Form

Key Features:

  • Integration with Leading Email Services: WP Mail SMTP seamlessly integrates with popular email services, including Gmail, Outlook, and SendGrid. This ensures that users can leverage their preferred email provider for reliable email transmission.
  • User-Friendly Setup Wizard: The plugin provides a user-friendly setup wizard within the WordPress dashboard, making it accessible to both beginners and experienced users. The intuitive interface guides users through the process of configuring SMTP settings effortlessly.
  • Security Priority with OAuth: WP Mail SMTP prioritizes security by supporting OAuth for secure authentication with email services. This adds an extra layer of protection, safeguarding sensitive information during email transmission.
  • Email Logging for Tracking: Users can track sent emails through the email logging feature, gaining insights into the delivery status of each email. This functionality is invaluable for monitoring and troubleshooting email communication.
  • Notifications for Failed Deliveries: The plugin offers notifications for failed email delivery attempts, ensuring that users are promptly alerted to any issues. This feature allows for quick troubleshooting and resolution of potential email delivery challenges.

Overall, WP Mail SMTP by WPForms emerges as a frontrunner due to its impressive features, user-friendly interface, and commitment to enhancing the reliability and security of email communication on WordPress websites. With its extensive integration options and emphasis on security, it has rightfully earned its place among the best WordPress SMTP plugins, providing users with a robust solution for their email delivery needs.


WP SMTP By WPOmnia has firmly established itself as one of the robust contenders in the WordPress SMTP plugins landscape, amassing an impressive 80,000 active installations. This plugin distinguishes itself through its flexibility and security features, offering a streamlined approach to SMTP configuration and providing users with customization options. Supporting both traditional SMTP and OAuth 2.0 authentication methods, WP SMTP By WPOmnia empowers users to tailor the authentication method according to their preferences and stringent security requirements.

The plugin’s customization options extend to personalizing the ‘From’ name and email address, ensuring that outgoing emails consistently reflect the brand identity of the sender. Leveraging the capabilities of SMTP, the plugin significantly enhances email deliverability, while the incorporation of SSL encryption adds an additional layer of security to the entire email transmission process.

Key Features:

  • Authentication Flexibility: WP SMTP By WPOmnia supports both traditional SMTP and OAuth 2.0 authentication methods. This flexibility enables users to choose the authentication method that aligns seamlessly with their preferences and stringent security requirements.
  • Customization Options: The plugin provides robust customization options, allowing users to personalize the ‘From’ name and email address. This ensures that outgoing emails maintain a consistent brand identity, enhancing the professionalism of email communication.
  • Enhanced Email Deliverability: Leveraging the capabilities of SMTP, the plugin contributes to significantly improved email deliverability. By utilizing SMTP for sending emails, users can mitigate common delivery issues associated with the default PHP mail() function.
  • SSL Encryption for Security: WP SMTP By WPOmnia prioritizes security by incorporating SSL encryption into the email transmission process. This added layer of security ensures that sensitive information remains protected during the entire email delivery journey.
  • User-Friendly Configuration: The plugin seamlessly integrates with the WordPress dashboard, providing a user-friendly settings page accessible through “Dashboard”->”Settings”->”WP SMTP”. The intuitive interface simplifies the configuration process, making it accessible to users of varying technical expertise.

Overall, WP SMTP By WPOmnia stands out as one of the versatile and secure solutions in the WordPress SMTP plugins landscape. With its commitment to flexibility, customization, and enhanced security, this plugin offers users a reliable tool to optimize their email communication on WordPress websites.

Easy WP SMTP by SendLayer

Easy WP SMTP by SendLayer lives up to its name by providing a hassle-free solution for configuring SMTP settings on WordPress websites, amassing a user base of 60,000 active installations. This plugin simplifies the process while offering features to enhance email deliverability and security. Supporting multiple SMTP servers, users have the flexibility to choose the server that best suits their needs. Moreover this plugin is also used for email marketing and many other purposes which also makes this plugin one of the best WordPress plugins for marketers.

SSL encryption ensures secure email transmission, protecting sensitive information during transit. The email logging feature allows users to track sent emails and gain insights into the delivery status of each email. Additionally, debugging options facilitate efficient troubleshooting, while customization settings enable users to personalize their email settings for a branded communication approach.

Key Features:

  • Multiple SMTP Server Support: Easy WP SMTP supports multiple SMTP servers, giving users the flexibility to choose the server that aligns with their specific requirements. This feature ensures a seamless and reliable email transmission process.
  • SSL Encryption for Security: The plugin prioritizes security with SSL encryption, guaranteeing a secure environment for email transmission. This safeguards sensitive information, providing users with peace of mind regarding the confidentiality of their email content.
  • Email Logging for Tracking: Users can leverage the email logging feature to track sent emails, gaining valuable insights into the delivery status of each email. This functionality is essential for monitoring the performance of email communication and addressing any issues promptly.
  • Debugging Options for Efficiency: Easy WP SMTP includes debugging options that log all failed email sending attempts, providing users with detailed information about the errors that caused the failures. This feature streamlines the troubleshooting process, making it more efficient and effective.
  • Customization Settings: The plugin offers customization settings that enable users to personalize their email configurations. This includes specifying a Reply-to or BCC email address, allowing for a tailored and branded communication approach.

Overall, Easy WP SMTP by SendLayer stands out as a reliable and user-friendly solution for WordPress users seeking to enhance their email deliverability. With its versatile features and emphasis on security, this plugin has earned its place among the best WordPress SMTP plugins, providing a seamless experience for configuring and managing SMTP settings on WordPress websites.


POST SMTP, with its 40,000 active installations, emerges as a reliable choice for WordPress users seeking a comprehensive solution for SMTP configuration. The plugin prioritizes user-friendliness, offering a setup wizard within the WordPress dashboard for seamless configuration. Supporting various authentication methods, including OAuth 2.0, POST SMTP ensures flexibility and security in email transmission.

Detailed email logs provide transparency into the delivery status of each email, aiding in monitoring and troubleshooting efforts. Customization options allow users to configure the sender name and email address, maintaining a professional communication approach. With SSL/TLS encryption, POST SMTP further enhances the security of email communication, safeguarding sensitive information.

Key Features:

  • Quick Setup Wizard: POST SMTP provides an easy-to-use and powerful 3-Step Setup Wizard for quick and seamless SMTP configuration, ensuring that users can get their email system up and running without hassle.
  • Detailed Email Logs: Users can quickly view, filter, and check the status of all WordPress emails and error messages with a simple click. This feature aids in monitoring email delivery and provides valuable insights for troubleshooting.
  • Post SMTP Mobile App [NEW]: The plugin offers a dedicated mobile app for monitoring WordPress emails on the go. Mobile users have access to multiple sites, detailed email logs, error checking, and the ability to resend failed emails directly from the app.
  • Extensive Email Reporting: Users receive a thorough report on their WordPress email deliverability performance, including email open tracking and other important statistics. This feature provides insights into the effectiveness of email campaigns.
  • Resend Email Attachments [PRO]: With the Pro version, users can resend any email attachment directly through the email log screen with a single click, streamlining the process of managing and sending important attachments.

Overall, POST SMTP stands out as another one of the versatile WordPress SMTP plugins, offering an array of features to enhance email deliverability and security. With its user-friendly setup wizard, detailed email logs, and additional capabilities in the Pro version, it proves to be a valuable tool for website owners looking to optimize their email communication system.

Fluent SMTP

Fluent SMTP, with an impressive 20,000 active installations, distinguishes itself with its simplicity and user-friendly approach to configuring SMTP settings for WordPress websites. This WordPress SMTP plugin provides a hassle-free solution for users of all technical expertise levels, aiming to enhance email deliverability and security. Supporting multiple SMTP services, Fluent SMTP grants users the flexibility to choose the service that aligns with their specific requirements.

The plugin prioritizes security through secure authentication methods, ensuring that emails are sent with protection against unauthorized access. With an insightful email logging feature, users gain visibility into the delivery status of each email, facilitating monitoring and troubleshooting.

Key Features:

  • Multiple SMTP Service Support: Fluent SMTP supports a variety of SMTP services, allowing users to choose the service that best suits their needs. This flexibility ensures compatibility with a range of email service providers.
  • Secure Authentication: The plugin emphasizes security with secure authentication methods, guaranteeing that emails are sent securely, minimizing the risk of unauthorized access. This feature is crucial for protecting sensitive information during the email transmission process.
  • Email Logging for Monitoring: Fluent SMTP’s email logging feature provides users with insights into the delivery status of each email. This functionality is invaluable for monitoring email communication, allowing users to track and troubleshoot email delivery effectively.
  • Customization Settings: Users can personalize their outgoing emails through Fluent SMTP’s customization settings. This feature contributes to a more engaging and branded communication approach, allowing for a tailored email experience.
  • Effortless Setup Process: Fluent SMTP prides itself on its easy setup process, ensuring a hassle-free experience for users. This user-friendly approach caters to individuals with varying levels of technical expertise, making it accessible to a broad user base.

Overall, Fluent SMTP also positions itself as one of the most user-friendly and reliable WordPress SMTP plugins, focusing on simplicity, security, and customization. With its extensive features, including multiple SMTP service support and secure authentication, Fluent SMTP provides an essential tool for users seeking to optimize email deliverability on their WordPress websites.


In conclusion, SMTP (Simple Mail Transfer Protocol) serves as the backbone of email communication, ensuring reliable delivery across the vast expanse of the internet. Understanding its significance and the benefits it offers is crucial for maintaining efficient email communication channels. Moreover, harnessing the power of WordPress SMTP plugins further enhances this process, simplifying setup, bolstering security, and maximizing email deliverability.

All of these plugins are tailored to be compatible with WordPress’s latest versions (6.4.2) and can also be integrated with popular WordPress Elementor themes. These Plugins can be integrated with premium WordPress themes that are available in the market and can help to increase the functionality of the website, which will ultimately result in more conversions on the website using these WordPress SMTP Plugins.   

The 5 best WordPress SMTP plugins discussed – WP Mail SMTP by WPForms, WP SMTP By WPOmnia, Easy WP SMTP by SendLayer, POST SMTP, and Fluent SMTP – stand out for their features, usability, and contributions to optimizing email communication on WordPress websites. By integrating these plugins into your WordPress site, you can take significant strides towards ensuring that your emails reach their intended recipients promptly and reliably, thus fostering stronger connections and engagement with your audience.


Previous Post
Next Post