The sending layer for cold email

Cold email that shows its work.

Send from your own inboxes and see the raw SMTP reply behind every send. No made-up health score.

Works with Google Workspace · SMTP · IMAP · your own inboxes

send log · live sending
maya@northwind.co250accepted · queued by Google
ceo@brightloop.io250accepted · opened 2m later
sales@vela.com421deferred · rate limited, easing off
j.pike@oldlist.co5.1.1bounced · address does not exist
ops@ferro.dev5.7.1bounced · blocked for reputation
Every send stores the receiving server’s exact response. No made-up score.

No health-score guesswork.

We store what Google actually replied on every send, and the real reason behind every bounce.

250
Accepted

Queued by the receiving server.

421
Deferred

Throttled. Your earliest warning, before a bounce.

5.1.1
Bounced

Bad address or blocked, told apart by DSN code.

The difference

What the server actually said.

A bounce that means your data is wrong, told apart from one that means your reputation is slipping. Same number, opposite fix.

CraftNudge deliverability report showing SMTP responses by code, each sending domain's last 14 days against its ramp, and why messages bounced

How it works

01

Connect your inbox

Your own Google Workspace, over SMTP and IMAP.

02

Write the sequence

Steps, delays, A/B variants, CSV variables.

03

Load the list

Any size. Duplicates and dead domains dropped.

04

Let it run

Paced, rotated, capped. It stops the moment they reply.

What is inside

Sending

Rotation, daily caps, ramp-up, human-random gaps.

Sequences

Multi-step, A/B that favours the winner, threaded follow-ups.

Deliverability reporting

Raw SMTP on every send, bounces classified by cause.

Reply detection

IMAP tells real replies from bounces, then stops the sequence.

Protection

One-click unsubscribe, auto-blocklist, a bounce-rate guard.

Foundations

An API behind every screen. Your workspace, isolated.

What it does not do

No warmup pool. No lead database. No AI writing your cold email from nothing.

Each is its own craft. We do sending properly and expect you to bring the rest. See how we compare.

Run your own outreach.

Connect an inbox, write a sequence, let it work the list at a pace that keeps you out of spam.