Universal SMTP relay infrastructure for apps & WordPress
Plug standard SMTP credentials into WordPress plugins, web frameworks, and server queues. Zero code changes required, sub-120ms relay latency, and real-time deliverability telemetry.
What is Mailofly SMTP Relay Service?
Mailofly SMTP Relay is a drop-in mail transfer service supporting TLS ports 587 and 465. It enables WordPress, Laravel, Rails, Django, and Postfix servers to send transactional emails without SDKs, delivering 99.99% uptime, automated SPF/DKIM alignment, and 3,000 free monthly emails.
STARTTLS & TLS ports
Relay uptime SLA
Free monthly emails
Technical Parameters & Standards
smtp.mailofly.com
587 (STARTTLS) / 465 (TLS/SSL) / 2525
Username: apikey, Password: [API Key]
WordPress, Laravel, Django, Postfix, Nodemailer
Engineered for developer velocity
Zero-code framework drop-in
Works immediately with WP Mail SMTP, FluentSMTP, Laravel MAIL_MAILER=smtp, Django EMAIL_BACKEND, and Ruby on Rails ActionMailer.
Automated DKIM & SPF alignment
Every message dispatched through the relay is signed with 2048-bit DKIM keys aligned to your verified custom domain.
30-day searchable handshake logs
Inspect exact SMTP response codes (250 OK, 451, 550), TLS handshake versions, and delivery latency for every transaction.
How it works
Copy SMTP credentials
Get your host (smtp.mailofly.com), port 587, and API key password from the dashboard.
Paste into your app or CMS
Add credentials to WordPress SMTP plugins, your .env file, or server configuration.
Send with instant deliverability
Dispatch emails through high-reputation pools with real-time delivery telemetry in your dashboard.
Frequently Asked Questions
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Ready to build with SMTP Relay Service?
Join thousands of engineering teams delivering transactional and lifecycle email with blazing speed and zero downtime.