Simple SMTP by Maileroo
Simple SMTP by Maileroo
Description
Are you struggling with WordPress not sending emails correctly? Simple SMTP by Maileroo is here to solve that! This plugin is designed to ensure your WordPress emails are sent reliably and efficiently, using your preferred SMTP service.
We aim to simplify and secure email delivery, ensuring your messages consistently land in the inbox. Simple SMTP by Maileroo fixes your email reliability by helping you switch to a proper SMTP Relay such as Maileroo, MailGun, SendGrid, etc. Simple SMTP by Maileroo is free to use and has everything you need to send your emails via WordPress!
SMTP Explained
SMTP, or Simple Mail Transfer Protocol, is the industry standard for sending emails across the internet. It plays a critical role in the email delivery process, acting as the protocol that governs the transmission of emails from one server to another. Understanding SMTP is essential for anyone managing email communications, particularly in a WordPress environment. If you do not use a proper SMTP relay service, your emails might go to spam, compromising their effectiveness and reach.
HTTP API Integration
Now, with the latest update, Simple SMTP by Maileroo offers HTTP API integration with Maileroo. This feature allows you to send emails via the Maileroo API, without the need for SMTP credentials. This is a great option for users whose hosting providers block SMTP ports or for those who prefer to use the Maileroo API for email delivery.
SMTP Relay Providers
Here are some of the popular SMTP Relay providers, each offering unique features and benefits for different email delivery needs:
Installation
- Install the Simple SMTP by Maileroo plugin either via the WordPress.org plugin repository or by uploading the files to your server.
- Activate the plugin in your WordPress Admin Panel.
- Navigate to the Settings page of the Simple SMTP plugin.
- Fill in the SMTP settings for your service. If you don’t have an SMTP provider, make sure to check out Maileroo for a free and reliable SMTP relay service.
- Save changes and test your SMTP credentials.
- Need more help? Let us know at our contact page.
Faq
Absolutely! Simple SMTP by Maileroo is designed to be compatible with a wide range of email services including Maileroo, Gmail, Outlook.com, Office 365, Yahoo, and more.
We’re here to help! If you need any help with the plugin setup, just let us know!
Please visit our contact page for more information.
We’re always open to suggestions! If there’s a feature you’d like to see in Simple SMTP by Maileroo, please let us know. While we can’t promise to implement every request, we seriously consider all feasible and sensible suggestions to enhance our plugin.
For the SMTP method of the plugin, you can easily add custom mail headers. In the example below, a tag header with the value of the “From Email” is added:
add_action('ssbm_add_custom_header', function($phpmailer) {
$phpmailer->addCustomHeader('X-Tag-from', $phpmailer->From);
});
A similar filter hook is available for the Maileroo API method. The following example adds the same tag header to the email message.
add_filter('ssbm_add_tags_api_method', function($payload) {
if (isset($payload['from']['address'])) {
$payload['tags'] = array('from' => $payload['from']['address']);
}
return $payload;
});
Reviews
Maileroo and this pluging - fantastic!
By Vizou (vizou) on October 28, 2025
This plugin works fantastically with Maileroo API or SMTP. I use it with Formidable Forms on several sites and it not only works perfectly, when it was first released, the developers kept improving it quickly and responded immediately to any questions I had. Highly recommended!
Simple SMTP plugin that works perfectly with Maileroo!
By richward1 on October 17, 2025
I'm surprised this SMTP plugin hasn't had more reviews or usage to date because I found it really easy to set up and use with its own Maileroo SMTP service.
I've been looking for an easy SMTP setup for my client websites for them to receive form submission notifications. I want to use an API rather than username and password for better security and reliability. My clients have various email providers so I want something I can use for all of them.
I like SMTP2Go but it is limited to 5 sending domains for its free SMTP service. I found Fluent SMTP very reliable to connect to other SMTP services but it has a limited number of services that it can connect to using API.
I recommend this and Maileroo to anyone looking for a similar solution to reliably send form submissions from their sites.
Easy and quick setup!
By Olaf Lederer (finalwebsites) on December 18, 2024
I'm using the Maileroo API option and emails are delivered so fast!
Excellent SMTP Relay service and a nice plugin.
Simple, no fluff
By 2000px on November 29, 2024
Enter API key/SMTP settings, set senders details and test connection.
That's really all the plugin need to do and this does it.
Changelog
= v1.1.5
- Improvement: I’ve added additional attachment validations to the Maileroo API mail function. This was necessary to prevent errors in certain situations.
- Other: I’ve added two useful links to the plugin on the plugin list page.
= v1.1.4
- Improvement: Cc, Bcc and From: headers are now also recognized when spelled in capital or lower case.
v1.1.3.1
- Bug Fix: Fixed a problem with misspelled reply-to headers.
= v1.1.3
- Improvement: Support for “Cc:” and “Bcc:” headers was still missing when calling the Maileroo Email API v2. This is now possible for both types of headers.
v1.1.2
- Bug Fix: Fixed a problem with an empty reply-to value from Elementor forms.
v1.1.1
- Bug Fix: Fixed a problem with multiple email recipients.
v1.1.0
- Improvement: Updated the API overide function to support the new Maileroo Email API v2.
UPDATE your custom filter hooks if you add tags to your emails (Check the FAQ for the updated example) - Bug Fix: In this version the Reply-To header finally works, sorry for the additional updates yesterday.
v1.0.10.1
v1.0.10
- Bug Fix: Fixed Reply-to header for the API email mode.
v1.0.9
- Improvement: It is now possible to add tags to an email message. See the FAQ section for the code examples.
- Improvement: The email “from:” header is no longer overwritten when it contains its own value.
v1.0.8
- Bug Fix: Fixed the plugin header in order to support localization.
v1.0.7
- Improvement: Prepared all code for localization.
v1.0.6
- Bug Fix: In some situations the mail headers are not read correctly for the API version
v1.0.5
- (Minor) Bug Fix
v1.0.4
The following contributions were made by Olaf Lederer.
- Improvement: Added the
ssbm_add_template_datafilter that allows third-party developers to use templates with the plugin.
v1.0.3
The following contributions were made by Olaf Lederer.
- Bug Fix: The plugin no longer loads the stylesheet unnecessarily.
- Improvement: The plugin will automatically add line-breaks and convert plaintext emails produced by WordPress.
v1.0.2
- Bug fixes and improvements
v1.0.1
- Added HTTP API integration with Maileroo
v1.0.0
- Initial release
