SMTP relay that just delivers

Connect your app to Inboxroad’s SMTP relay. Whether you’re sending your first campaign or scaling to millions, we ensure consistent delivery and a strong sender reputation.

Connect via SMTP Start sending
SMTP Feature just delivers Inboxroad

We currently route ~120M emails/week. Median inbox rate (last 90 days): 97.1%.

Reliable email delivery. Simplified

Everything you need: authentication, safe warm-up, real-time monitoring, and human support. So your emails land where they belong: the inbox.

Build sender reputation

Start with a safe warm-up plan and aligned SPF, DKIM, and DMARC. We pace per provider so you ramp without trips to spam.

Real humans, real time

A named deliverability engineer you can reach via phone or email — no ticket limbo.

Eyes on your traffic

24/7 monitoring for blocklists, bounce spikes, and complaint rates. We alert, fix, and report.

Scale without limits

Whether you’re sending transactional updates or large-scale campaigns, Inboxroad grows with your needs.

The easiest way to send

Add your sending domain, connect your app, and start sending. Most senders go live the same day after DNS verification.

SMTP Feature overview Inboxroad

Connect

Point your app to Inboxroad with your credentials and choose your port (587).

Configure

Use the same domain for your From email and Return-Path, and enable TLS for secure sending.

Send

Begin a controlled warm-up; we monitor placement, deferrals, and complaints, adjust throttles, and scale volume safely.

Your sending, optimized

Track what matters in your dashboard: authentication status, volume, delivery rate, and complaints. So you can send with confidence, week after week

Stay in control

Use our SMTP relay to reach inboxes, and keep control of your sendings.

  • IP control: start shared; switch to dedicated when volume increases.
  • Weekly insights: inbox placement, bounce/ complaint breakdown, next steps.
  • Deliverability consulting: blacklist and delistings, and advice on email best practices.
Open setup guide Start sending

Send reliably via SMTP

Forward messages through Inboxroad’s SMTP relay for fast, secure delivery.

  • Trusted routing & redundancy across regions.
  • Authentication support: SPF, DKIM, DMARC alignment.
  • Security: TLS 1.2+, rDNS/PTR.
  • Deliverability monitoring baked in. Not an add-on.
Open setup guide Start sending

Seamless SMTP setup

Connect any client or platform, just configure and go.

  • No coding needed: plug in credentials and start sending.
  • Warm-up included: safe ramps per provider and domain.
  • 24/7 expert support: immediate help during warm-up.
Open setup guide Start sending