Mesh SMTP – Easy WordPress SMTP & Email Delivery for WordPress

Custom SMTP support with optional authentication for trusted relays

Test email flow with honest Accepted, Received and Confirmed, Failed, and Retest Required states

Automatic test invalidation when SMTP settings change

Clear SMTP host, TLS/SSL, port, authentication, username, password, From Email, and From Name fields

Recommended port guidance without overwriting a custom port

Saved password indicator with a dedicated Remove Saved Password action

Warning when another common SMTP plugin appears active

Microsoft 365 warning when OAuth or tenant SMTP AUTH policy may be required

Privacy-first email logging: Off, failures only, or all mailer results

Optional masked, hidden, or full recipient storage

Optional subject logging and 7, 14, or 30-day retention

Clear Logs and Clear Last Failure actions

Masked support summary by default, with an explicit option to include personal details

Safe JSON settings export and import without exporting the SMTP password

wp-config.php constants for deployment-managed SMTP credentials

WordPress Site Health integration

Accessible provider cards, wizard steps, live status messages, and password controls

Admin assets load only on the Mesh SMTP screen

Capability checks, nonces, sanitization, and escaped output

Honest Test Email Results A successful wp_mail() response means WordPress and PHPMailer accepted the sending request without returning an error. It does not prove that the message reached the Inbox.

Mesh SMTP therefore uses a two-part verification flow:

Accepted by mailer — WordPress returned no sending error.

Received and confirmed — an administrator checked the Inbox or Spam folder and confirmed receipt.

This avoids a misleading “delivered” message when the receiving mail server may still delay, filter, or reject the email.

Privacy-First Email Logs Email logging is configurable. The recommended default stores failed emails only, masks recipient addresses, hides subject lines, and removes old entries after 14 days.

Mesh SMTP never stores email bodies or attachments in its activity log.

Supported Provider Presets

Gmail and Google Workspace

Outlook and Microsoft 365

Zoho Mail

Hostinger Email

SendGrid

Mailgun

Custom SMTP

Microsoft 365 Note Some Microsoft 365 tenants do not allow username/password SMTP. OAuth 2.0 or an administrator-enabled SMTP AUTH policy may be required. Mesh SMTP currently supports standard SMTP credentials and displays a warning when the Microsoft preset is detected.

Secure wp-config.php Constants Developers can define these constants in wp-config.php to override values saved in WordPress:

MESHSMTP_ENABLED MESHSMTP_HOST MESHSMTP_PORT MESHSMTP_SECURE MESHSMTP_AUTH MESHSMTP_USERNAME MESHSMTP_PASSWORD MESHSMTP_FROM_EMAIL MESHSMTP_FROM_NAME

The SMTP password is never shown back in the admin interface.