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Everything the free plugin does

BooleanSMTP is complete without Pro: every feature on this page is in the free plugin, with no limit on connections.

Sending

Native connections
Gmail / Google Workspace, Microsoft 365 / Outlook, and Amazon SES. Gmail, Microsoft 365, and Amazon SES send over their HTTP API, with no SMTP port to open; Gmail and Microsoft 365 sign in with OAuth, using your own app.
Any SMTP server
Custom SMTP connects to any provider or host that gives you SMTP details, with the encryption and port it needs.
Several connections at once
A primary connection, a fallback, and more. Each From address belongs to one connection, so every message leaves through the connection that owns its sender.
Simulation mode
On a staging copy, record every email in the log instead of sending it.
The BooleanSMTP Mailers screen: four connections. Amazon SES is the default, Custom SMTP the fallback, each with its sender, mode, status and health.
The BooleanSMTP setup wizard on its Provider step: five steps from Start to Review, and a choice of Amazon SES, Google Workspace, Microsoft 365, Custom SMTP or PHP mail.

Logging and reliability

Every email logged
Recipient, subject, status, provider, the provider’s error and the delivery time. Search, filter, preview and resend from the log.
Retention you control
Logs are kept 30 days by default; choose your own period.
Retries on your other connections
When a send fails: one immediate retry on the fallback, then the retry queue. The exact path is below.
Test email and health checks
Send a test through any connection and read the full result; every connection shows its health.
The BooleanSMTP Email Logs screen: messages with their status, recipient, subject, mailer, time and attempts. A failed message shows the provider's error and a resend button.
BooleanSMTP settings: Amazon SES is the default connection, Custom SMTP the fallback, and Retry on other connections is on.
The BooleanSMTP Email Deliverability Test: a test sent through the Custom SMTP connection, delivered in 412 milliseconds, with the SMTP handshake in the Activity Console and the login lines replaced by 'credentials hidden'.

Alerts

Slack, Discord, or Telegram
A notice when a message finally fails to send, or when a connection fails its health check or can no longer refresh its sign-in. Never the connection’s credentials.
A BooleanSMTP alert in a chat channel: Email Delivery Failure, a message could not be delivered after all configured attempts, with the recipient, subject, provider and a button to open the logs.

Switching

Import from 6 SMTP plugins
FluentSMTP, WP Mail SMTP, Post SMTP, Easy WP SMTP, SureMail, and GoSMTP: connections and email logs, assessed first and imported as inactive drafts.
Terminal
# Assess first: nothing is written
$ wp boolean-smtp import wp-mail-smtp --dry-run

# Then import connections and the email log, as drafts
$ wp boolean-smtp import wp-mail-smtp --logs

For developers and site operators

WP-CLI
wp boolean-smtp test-email, connections:list, logs:export, queue:work, import, migrate and hooks:list.
REST API and hooks
A documented REST API (booleansmtp/v1) behind the manage_options capability, and public hooks under the boolean_smtp_ prefix.
A background queue
Route chosen messages, a newsletter for example, into a queue that runs from WP-Cron or wp boolean-smtp queue:work.
Encrypted credentials
AES-256-CBC with HMAC-SHA-256, keyed to your site, or to BOOLEAN_SMTP_ENCRYPTION_KEY in wp-config.php.
// Keep Amazon SES keys out of the database
define( 'BOOLEANSMTP_AWS_ACCESS_KEY_ID', 'AKIA…' );
define( 'BOOLEANSMTP_AWS_SECRET_ACCESS_KEY', '…' );
define( 'BOOLEANSMTP_AWS_REGION', 'us-east-1' );

// Your own key for encrypting stored credentials
define( 'BOOLEAN_SMTP_ENCRYPTION_KEY', '…' );

// Keep settings and logs if the plugin is ever deleted
define( 'BOOLEAN_SMTP_PRESERVE_DATA', true );
$ wp boolean-smtp connections:list --format=count
4
$ wp boolean-smtp test-email you@example.com --html
$ wp boolean-smtp logs:export --days=7 --status=failed
$ wp boolean-smtp queue:work --limit=50 --retry
$ wp boolean-smtp import fluent-smtp --dry-run
$ wp boolean-smtp hooks:list --type=action
// Fires after a send attempt fails, before the fallback is tried
add_action( 'boolean_smtp_email_failed', function ( array $payload ) {
    my_team_pager( $payload );
} );

// Keep email logs for 90 days instead of 30
add_filter( 'boolean_smtp_log_retention_days', fn() => 90 );

// Register a transport of your own
add_filter( 'boolean_smtp_transports', function ( array $transports ) {
    $transports['custom'] = MyTransport::class;
    return $transports;
} );

What happens on failure

  1. Right away

    Sent on its connection

    The message goes out on the connection chosen for it.

  2. If it is refused

    One immediate retry on the fallback connection

    No waiting: your fallback connection gets it straight away.

  3. After about 1 minute

    A retry on your other connections

    Retry on other connections is on by default and uses your other active connections.

  4. After about 5 minutes

    Another retry

    Up to two more attempts, after about 1 and 5 minutes, by default.

  5. Only if all of that fails

    Logged as Failed, and you are alerted

    A message to Slack, Discord, or Telegram links to the log entry, which holds the provider’s error. Resend it from there once it’s fixed.

The screens

The plugin’s own admin, as listed on WordPress.org.

Overview: delivery totals for the chosen period, the traffic chart, system status and recent activity.
Overview: delivery totals for the chosen period, the traffic chart, system status and recent activity.
Mailers: every connection with its sender, mode, status and health; the default and fallback are marked.
Mailers: every connection with its sender, mode, status and health; the default and fallback are marked.
Add a mailer: Amazon SES, Google, Microsoft, any SMTP server or PHP mail.
Add a mailer: Amazon SES, Google, Microsoft, any SMTP server or PHP mail.
Email logs: search and filter every message, see failures at a glance and resend them.
Email logs: search and filter every message, see failures at a glance and resend them.
A logged email: recipient, sender, mailer, delivery result and a preview of the message.
A logged email: recipient, sender, mailer, delivery result and a preview of the message.
Test email: send through the default or any connection and read the result.
Test email: send through the default or any connection and read the result.
Settings: default and fallback connection, retries on other connections, logging and retention.
Settings: default and fallback connection, retries on other connections, logging and retention.
Alerts: Slack, Discord and Telegram, each connected once.
Alerts: Slack, Discord and Telegram, each connected once.
Migration: bring the connections and email log of another SMTP plugin over as drafts.
Migration: bring the connections and email log of another SMTP plugin over as drafts.

Which mailer fits you?

Four questions, and the setups that suit your site rise to the top. Each links to its setup guide in the documentation.

Where does your business email live?

What does your site send?

Do you already have an Amazon Web Services account?

How would you rather connect?

  1. Google Workspace

    API (sign in with Google) or SMTP

    Setup guide: Google Workspace

  2. Microsoft Outlook

    Microsoft Graph API (sign in with Microsoft)

    Setup guide: Microsoft Outlook

  3. Amazon SES

    API or SMTP

    Setup guide: Amazon SES

  4. Custom SMTP

    SMTP

    Setup guide: Custom SMTP

  5. PHP Mail

    WordPress default mail

    Setup guide: PHP Mail

BOOLEANSMTP PRO

Coming soon

More control for every stage of delivery.

A look at what’s coming: smarter ways to choose a provider, handle delivery problems and understand the results.

  • Same sender, multiple providers

    Use one From address across connections on different providers.

  • Grouped rotation

    Choose failover, weighted balance or daily-cap overflow for each sender group.

  • Routing rules

    Choose how different kinds of mail move through your connections.

  • Bounce handling

    Bring provider bounce and complaint events into each email’s history.

  • Suppression engine

    Manage addresses flagged by bounces and complaints.

  • Delivery analytics

    See sending volume, outcomes and trends together.

  • One-click OAuth setup

    Make supported provider sign-ins quicker to configure.

  • Sending-domain DNS check

    Review SPF, DKIM and DMARC for your sending domain.