[WordPress] 外掛分享： SendGrail SMTP – Secure Email Delivery, Routing & Email Log for Gmail, Outlook, Office 365 & Custom SMTP

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WordPress emails landing in the spam folder, or worse, not delivering at all.
That’s the common scenario among WordPress site owners.
By default, WordPress uses the standard PHP mail function to send emails, which is notoriously unreliable and frequently blocked by major email clients.
SendGrail SMTP solves this problem permanently and without charging you a penny. YES! SendGrail is 100% free with no paid option at all.
SendGrail completely reconfigures how your WordPress site sends out emails. By routing your outgoing messages through dedicated, trusted SMTP (Simple Mail Transfer Protocol) providers, we ensure that your password resets, WooCommerce receipts, and contact form submissions reach your users’ inboxes every single time.
Designed for both beginners and advanced users, SendGrail combines a streamlined, one-click setup with powerful enterprise-grade tools like automatic failover routing and real-time delivery logs.
Core Features

Multiple SMTP Providers: Connect seamlessly with the most popular and reliable email delivery services including SendGrid, Mailgun, Amazon SES, Postmark, Google (Gmail/Workspace), Microsoft (Outlook/Office 365), and any standard custom SMTP server.
Automatic Fallback Routing: Never lose an important email. If your primary SMTP provider experiences downtime or fails to send a message, SendGrail automatically attempts to resend using a secondary backup provider.
Detailed Email Logging: Keep a complete record of every email sent from your website with delivery status details and timestamps.
Secure Credentials: Define credentials directly in wp-config.php for security.
One-Click Setup: Guided setup wizard for quick configuration.
Advanced Debug Mode: View detailed logs to troubleshoot connection issues.
Multisite Support: Manage settings centrally or per sub-site.

SMTP Mailers
SendGrail SMTP has a bunch of popular mailers to make sure your emails are delivered correctly.

Google Workspace
Read the Google Workspace documentation
Microsoft Outlook
Read the Microsoft Outlook documentation
Brevo (formerly Sendinblue)
Read the Brevo documentation
Mailgun
Read the Mailgun documentation
SendGrid
Read the SendGrid documentation
Amazon SES
Read the Amazon SES documentation
Postmark
Read the Postmark documentation
Mailjet
Read the Mailjet documentation
SendGrid
Read the SendGrid documentation
Netcore
Read the Netcore documentation
Elastic Email
Read the Elastic Email documentation
SendLayer
Read the SendLayer documentation
SparkPost
Read the SparkPost documentation
Resend
Read the Resend documentation
Zoho Mail
Read the Zoho Mail documentation
SMTP2Go
Read the SMTP2Go documentation
Mandgrill
Read the Mandgrill documentation
Custom (Add your own)
Read the Custom SMTP documentation