SendGrail SMTP – Secure Email Delivery, Routing & Email Log for Gmail, Outlook, Office 365 & Custom SMTP

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.

1. Google Workspace
2. Microsoft Outlook
3. Brevo (formerly Sendinblue)
4. Mailgun
5. SendGrid
6. Amazon SES
7. Postmark
8. Mailjet SMTP
9. SendGrid SMTP
10. Netcore
11. Elastic Email
12. SendLayer
13. SparkPost
14. Resend
15. Zoho Mail
16. SMTP2Go
17. Mandgrill
18. Custom (Add your own)

External Services

This plugin connects to third-party SMTP servers to deliver emails on your behalf. The connection only occurs when you configure an SMTP provider and WordPress sends an email. The data transmitted includes the email content (recipients, subject, body, and attachments) as required by the SMTP protocol.

No connection is made until you choose a provider and enter your credentials. You can also use any custom SMTP server.

Gmail / Google Workspace

• Connects to smtp.gmail.com to send emails via your Gmail or Google Workspace account.
• Google Terms of Service | Google Privacy Policy

Microsoft 365 / Outlook

• Connects to smtp.office365.com to send emails via your Microsoft account.
• Microsoft Services Agreement | Microsoft Privacy Statement

Yahoo Mail

• Connects to smtp.mail.yahoo.com to send emails via your Yahoo Mail account.
• Yahoo Terms of Service | Yahoo Privacy Policy

SendGrid (Twilio)

• Connects to smtp.sendgrid.net to send transactional emails via SendGrid.
• Twilio Terms of Service | Twilio Privacy Policy

Mailgun (Sinch)

• Connects to smtp.mailgun.org to send transactional emails via Mailgun.
• Mailgun Terms of Service | Mailgun Privacy Policy

Amazon SES (AWS)

• Connects to email-smtp.us-east-1.amazonaws.com (region may vary) to send emails via Amazon Simple Email Service.
• AWS Customer Agreement | AWS Privacy Notice

Postmark (ActiveCampaign)

• Connects to smtp.postmarkapp.com to send transactional emails via Postmark.
• Postmark Terms of Service | Postmark Privacy Policy

Mandrill (Mailchimp / Intuit)

• Connects to smtp.mandrillapp.com to send transactional emails via Mailchimp Transactional.
• Mailchimp Terms of Use | Intuit Privacy Statement

Elastic Email

• Connects to smtp.elasticemail.com to send emails via Elastic Email.
• Elastic Email Terms of Use | Elastic Email Privacy Policy

SMTP2GO

• Connects to mail.smtp2go.com to send emails via SMTP2GO.
• SMTP2GO Terms of Service | SMTP2GO Privacy Policy

Mailtrap (Railsware)

• Connects to live.smtp.mailtrap.io to send emails via Mailtrap.
• Mailtrap Terms of Service | Mailtrap Privacy Policy

Zoho Mail

• Connects to smtp.zoho.com to send emails via your Zoho Mail account.
• Zoho Terms of Service | Zoho Privacy Policy

Brevo (formerly Sendinblue)

• Connects to smtp-relay.brevo.com to send emails via Brevo.
• Brevo Terms of Use | Brevo Privacy Policy

Custom SMTP

• You may also configure any custom SMTP server. The plugin will connect to the host you specify.