You build the product.
We'll keep your customers' email in the inbox.

If you're a martech or SaaS platform, your customers expect email that just works. Netcore gives you MTA-level deliverability control without running an MTA.

50 Bn+ emails / month 99.9% deliverability 6,500+ brands
See how it'd plug into your stack.
15-min call with a deliverability engineer. No pitch deck, no SDR queue.
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Meanwhile, see how Remarkety 3x'd their email volume on Netcore.

WHAT G2 USERS SAY

What developers and ops teams say about Netcore Email API.

4.6 / 5
G2 Verified Reviews
★★★★★
B
Bala chandra R.
DevOps Engineer · Mid-Market
★★★★★5/5
"Easy SMTP & REST API Integration"
Helps us send transactional and bulk emails reliably without managing our own email servers. Delivery tracking and analytics make it easy to monitor performance and troubleshoot issues.
Verified3/27/2026
A
Aditya K.
Campaigns Manager · Enterprise
★★★★★5/5
"Most Reliable and Stable Email API"
Smooth and best in terms of UX. Customer care resolves issues instantly. Executes multiple campaigns at a time with personalisation, maker-checker, and no scope of error on the pane.
Verified9/18/2025
N
Nila D.
Travel Agent · Mid-Market
★★★★4.5/5
"Reliable Email Delivery and Effortless Integration"
Solves reliable email delivery for booking confirmations, alerts, and customer communication. Improves trust and reduces delivery failures for our travel services.
Verified12/29/2025
PK
Pradeep K.
System Admin · Enterprise
★★★★★5/5
"Simple and best SMTP and API cloud-base service provider."
Consistent high inbox placement, dedicated IP options, scales from hundreds to millions with minimal latency. Real-time analytics and event webhooks, well-documented REST API, responsive onboarding.
Verified9/19/2025
WHY ISVs PARTNER WITH NETCORE

The control of an MTA.
Without operating one.

Most ESPs are a black box. Most MTAs are a 6-month infra project. Netcore is the middle path, you keep your roadmap, we keep the inbox open.

★ THE DIFFERENTIATOR

You get the dials. We carry the pager.

Every other cloud ESP hides the MTA from you. Running your own means hiring a deliverability team, managing IP warmup, monitoring blacklists, and handling postmaster relationships across Gmail, Yahoo, Outlook, and a long tail.

Netcore gives you tenant-level control without forcing you to become an email infrastructure company. You define routing, throttles, policies, and suppression logic per customer. We run the MTA, manage ISP relationships, protect reputation, and keep delivery stable at scale.

Authentication & domain alignment Netcore
MTA cluster & IP warmup Netcore
Feedback loops & ISP relations Netcore
Bounce / complaint classification Netcore
Per-tenant routing & throttles You
Reputation policy & suppression You

Scale to 1 Bn+ without re-platforming

Remarkety scaled from 300 M → 1 Bn+ messages/month on Netcore without changing a single integration. The infra grows with your customer base, no replatform, no quota panic.

AI-powered delivery, not just analytics

Adaptive send sequencing, smart IP routing, predictive send-time, content-risk scoring. AI lives at the send layer, not just on a dashboard you check once a month.

A real partner team, not a CSM rotation

A dedicated deliverability engineer, slack-channel access, joint QBRs with your sender ops. We answer at 2am during holiday peaks because your customers do too.

WHAT YOU CAN EMBED

Four capabilities. One contract.

A send-anything API your customers won't outgrow.

Transactional, marketing, journey-triggered, one endpoint, one auth model, every send type. Built for multi-tenant ISVs from day one.

  • Sub-second p50 latency : For transactional sends, globally.
  • Per-tenant API keys & IPs : Isolate every customer's reputation by default.
  • Webhooks for every event : Delivered, Bounced, Opened, Complained, Unsubscribed.
  • Idempotency, retries, batching : The API stays sane during your customer's Black Friday.
  • Real SDKs : In Node, Python, PHP, Java, Go, Ruby. Postman-importable OpenAPI spec.
POST /v1/mail/send X-Tenant-Id: cust_8f2c // → routed to dedicated IP pool
200Accepted · queued for delivery42 ms
deliveredwebhook · user@gmail.com1.4 s
openedwebhook · iOS Mail28 s
clickedwebhook · /orders/384739 s

The 95%+ deliverability your customers brag about.

We treat deliverability as an engineering problem, not a support ticket. Twenty-five years of postmaster relationships, distilled into automated guardrails.

  • Automated IP warmup : Per tenant, onboarding from 0 → 10M/day in weeks, not months.
  • Real-time blacklist & complaint monitoring : With auto-mitigation.
  • DMARC, BIMI, SPF, DKIM : Setup wizards your customers can self-serve.
  • Postmaster relationships : With Gmail, Yahoo, Outlook, Apple, AOL, JP/EU/IN ISPs.
  • Inbox placement reporting : Primary vs. promotions vs. spam, per tenant.
Inbox placement · last 7 days
Gmail
99.4%
Outlook
98.7%
Yahoo
99.1%
Apple iCloud
97.9%
Industry avg
83.2%
Aggregate of Netcore-monitored seedlists. Per-tenant detail in your dashboard.

MTA-level control. None of the MTA operations.

The exact dials a deliverability engineer would want, IP pool design, routing rules, throttles, bounce policies, exposed as API and dashboard. We run the metal underneath.

  • Dedicated, shared, or hybrid IP pools : Per tenant. Split by send type or geography.
  • Custom routing rules : Route Gmail through pool A, Outlook through pool B, by tenant.
  • Throttle & rate-limit policies : Set per IP, per domain, per ISP.
  • Bounce classification : Hard, soft, transient, content, policy, surfaced as structured events.
  • Suppression list APIs : Global, per-tenant, per-list.
Who runs what
1
Per-tenant routing & throttlesDefine policies; we enforce at the MTA
You
2
MTA cluster & IP warmupAuto-scaling, multi-region
Netcore
3
Feedback loops & postmaster relationsWe carry the pager
Netcore
4
Blacklist mitigationAuto-detection & remediation
Netcore

AI that lives at the send layer.

Not a chatbot bolted on a dashboard. Real-time models score every send, every recipient, every domain, and adjust before the message leaves the queue.

  • Adaptive Send Sequencing : First-responders fire first to pull the rest into the Primary inbox.
  • Predictive send-time : Per recipient, beats time-zone heuristics by 15–40%.
  • Content-risk scoring : Flag spammy patterns before send, not after a blacklist hit.
  • Smart suppression : Predicted-disengaged recipients held back automatically.
  • Self-tuning IP pools : Load-balance based on real-time ISP feedback.
Live decisions · last 60 s
Held 1,247 recipients · predicted disengagement > 0.82
Re-routed Gmail traffic · pool B latency spike detected
Send-time deferral · 2,431 recipients shifted to optimal window
Content risk flag · 'free $$' pattern · template auto-rewritten
Warmup tier advanced · cust_8f2c → 500k/day
FROM HANDSHAKE TO LIVE

Four steps. Most ISVs are live in two weeks.

1

Partner kickoff

Sandbox keys in your inbox the same day. A deliverability engineer joins your shared Slack channel.

Day 0–1
2

Integrate the API

Drop in our SDK or hit the REST endpoint. Multi-tenant model is built in, pass X-Tenant-Id and you're done.

Day 2–5
3

Warm up & route

We auto-warm dedicated IPs by tenant. You design routing & suppression policies in dashboard or API.

Day 5–10
4

Go live & scale

Production cutover. Joint QBRs, real-time alerts, and a phone number for holiday peak.

Day 10–14
★ ISV CASE STUDY · REMARKETY

From 300 M to 1 Bn+ emails a month -
without re-architecting a thing.

Remarkety powers email & SMS marketing for Shopify, Magento, BigCommerce, WooCommerce merchants. When they outgrew their previous infra, they didn't want to replatform. They wanted a partner who could carry the deliverability load while they focused on product.

"Since we began our collaboration with Netcore Cloud, Remarkety has not only tripled our email volume from around 300 million to over 1 billion messages per month, but we have also achieved a remarkable 99.9% deliverability rate. Their state-of-the-art technology and consistent support have allowed us to maintain operations without any downtime, even during the most demanding times."
JP
Joel Presman Remarkety · on the Netcore partnership
0
Email volumeTripled in months, not years
0
DeliverabilitySustained, including holiday peaks
0 downtime
ReliabilityThrough Black Friday + holiday season
0
Messages / monthAnd still scaling
~300 M / mo ───────▶ 1 Bn+ / mo
3.3×volume on the same integration
CUSTOMER STORY

Hear it from Remarkety directly.

How a leading eCommerce marketing platform scaled to 1 Billion emails a month with 100% deliverability on Netcore.

BUILT FOR DEVELOPERS

An API your team will actually want to integrate.

Postman-importable, sandbox-keyed, multi-tenant from line one. We sweat the ergonomics so your engineers ship in days.

OpenAPI 3.1 spec & SDKs

Node, Python, PHP, Java, Go, Ruby. Generated from a single source of truth. Sandbox keys minted in the dashboard in 30 seconds.

Webhooks for every event

Delivered, bounced, opened, clicked, complained, unsubscribed. Signed, retried, idempotent.

Multi-tenant by default

Pass X-Tenant-Id. Per-tenant keys, IPs, suppression lists, reports, no glue code required.

Rate limits that flex with you

Burst, sustained, per-tenant. Auto-raised based on warmup and reputation, not a support ticket.

await nc.mail.send({ tenant: "cust_8f2c", from: "hello@yourcustomer.com", to: user.email, subject: "Your weekly summary", html: template.render(user), tags: ["weekly", "digest"], tracking:{ opens: true, clicks: true }, idempotencyKey: digest.id }); // → { messageId: "msg_3f...", status: "queued" }
COMPLIANCE & TRUST

Built for the audits your customers run on you.

Procurement is the slowest part of any enterprise sale. We ship the questionnaires, SOC 2 reports, DPAs, and sub-processor lists you'd otherwise spend two quarters chasing.

SOC 2 Type II
Audited annually
ISO 27001
Info security mgmt
GDPR
EU data residency
HIPAA-ready
BAA on request
Data residency
US · EU · IN · APAC
DPA & sub-proc
Self-serve in portal
99.99% uptime
Status page · SLA
SSO & SCIM
Enterprise IdP
LET'S TALK

Let's see what your inbox
could look like on Netcore.

A 15-minute call with a deliverability engineer, not an SDR. We'll talk about your sending pattern, your customers' pain points, and what migration looks like.

  • Sandbox keys in your inbox the same day
  • Custom integration plan within 48 hours
  • Joint deliverability audit on request
  • No quota commitments to start
Talk to a deliverability engineer.
We reply within one business day.
Please enter your name
Please enter a valid work email
We're a partner, not a vendor. No SDR funnel. No drip campaign.

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