Email infrastructure for multi-tenant platforms

Every tenant isolated.
Every email delivered.
You never think about it.

One integration. Five minutes. Your platform gets per-tenant sending reputation, automated warm-up, and real-time abuse containment. No DNS to manage. No monitoring to build. No deliverability hire to make.

Live in 5 minutesFrom $49/moCancel anytime
Platform Overview
Live
99.2%
Inbox placement
0
Support tickets
348 / 348
Tenants sending
All systems nominal
Recent events
12:04Acme SaaS — 241 emails delivered, 99.6% inbox
12:03Vercel Tools — 89 emails delivered, 100% inbox
12:05DirtyList Co — bounce rate rising (4.2%)
12:06DirtyList Co — auto-paused at 8.1% bounce
12:06→ webhook sent to your-app.com/hooks
12:06347 other tenants — delivering normally, 0 affected
Platform inbox placement unchangedNo action required

Infrastructure

Sub-3s average delivery
From API call to inbox
DKIM in under 200ms
Provisioned per tenant on first send
Gmail, Microsoft, Yahoo
Real-time complaint feedback loops
4 isolated IP pools
Proven · Warming · Probation · New

You've already lived through this. A tenant imports a purchased list, bounces spike, and suddenly your best clients' confirmations land in spam.

72%

of multi-tenant platforms have had a deliverability crisis caused by a single tenant

$4,200

average cost per incident — engineering time, support load, client trust gone

14 days

to recover domain reputation after a complaint spike

How it works

One integration.
Every tenant protected.

1

Swap one API call

5 min

Same REST pattern you're already using. Same SMTP fallback. Your templates, your logic — nothing else changes.

POST /v1/send { "tenant_id": "acme", ... }
2

Tenants get isolated

Instant

Own subdomain, own DKIM, own warm-up schedule. You don't touch DNS. We provision on first send.

acme.yourdomain.com → DKIM ✓ SPF ✓
3

Bad actors get contained

24/7

Bounce rate crosses 5%? Auto-throttled. Complaint rate hits 0.3%? Paused. Everyone else keeps sending.

bounce > 5% → throttle → webhook → you
Get Started →

Your options

Ignore it, build it, hire for it, or plug it in.

Do nothing
Build it
Hire
Mailmont
Tenant reputation isolation
—
Manual
Manual
Automatic
Warm-up per new tenant
—
Build it
Oversee it
Built-in
Abuse detection
—
Build monitoring
Judgment calls
Real-time
Per-tenant data
—
Build BI layer
Manual reports
Included
Time to ship
None
3–6 months
2–3 mo. hire
< 1 day
Annual cost
$0 + risk
~$50k eng.
~$140k salary
From $588

Pricing

Start at $49. Scale when you do.

Plus $1.50 per 1,000 emails on every plan. No contracts. Cancel anytime.

Every account is verified with a card on file.
No throwaway signups. No spammers testing the waters. Your tenants send alongside other verified platforms — the pool stays clean because everyone has skin in the game.

Mini

Up to 15 tenants

For early-stage platforms with their first handful of clients.

$49/mo
Per-tenant subdomain + DKIM isolation
Basic health dashboard
Automated warm-up per tenant
Webhook alerts on threshold breach
Shared IP pool
Docs + community support
Get Started →
Most Popular

Growth

Up to 200 tenants

For platforms past MVP with a growing client base.

$149/mo
Everything in Mini
Auto-throttle and auto-pause
Gmail, Microsoft, Yahoo feedback loops
Per-tenant health scoring
Dedicated IP pool
Email support + Slack
Get Started →

Scale

Up to 2,000 tenants

For established platforms where deliverability is revenue-critical.

$499/mo
Everything in Growth
Multiple dedicated IP pools
IP pool segmentation (proven / warming / probation)
Custom DMARC reporting
Priority support
Dedicated deliverability engineer
Get Started →

Above 2,000 tenants? Let's design your architecture together.

Just getting started? Try pay as you go — $0 until you send →

Common questions

Deliverability depends on keeping bad actors off the platform. A verified card filters out the people who would abuse sending infrastructure — which protects inbox placement for every tenant on every platform we serve. It's the same reason Postmark has the best reputation in the industry: they're selective about who sends.

Emails queue, nothing drops. Once the bounce rate comes back down, they release gradually. You get a webhook with the reason.

No. Route tenant emails through Mailmont, keep product emails on whatever you use now. Most teams consolidate within a month but nothing forces it.

Yes. Bring their domain, we handle DKIM and SPF via API. Or use a Mailmont subdomain. Both get full isolation.

No problem. Pricing scales linearly — $2/tenant. Above 5,000 we'll design your IP pool architecture together and discuss volume discounts.

You can. Budget a quarter of engineering for provisioning, monitoring, throttling, IP management, and dashboards. Then ongoing maintenance. Or ship in a day with us.

$1 per 1,000 emails, metered monthly. Set spend caps per tenant or platform-wide. No surprises.

Stop firefighting
email infrastructure.

One integration. $2/tenant. Every tenant isolated. Live in five minutes.

Get Started →