MailNurse watches every mailbox in your Instantly account and fixes what breaks. It pauses mailboxes that land in spam, replaces burned domains, and rewrites tired copy. Your campaigns keep landing in the inbox, and you stop babysitting them.
14 days of Pro free · No card needed · Free plan after
What needs you
Connect Instantly
Paste one API key so MailNurse can watch your mailboxes.
6 new mailboxes are ready
They are built and warming. Nothing to do but wait 21 days.
Replace owen@kelthorn.com
Its domain is burned. One click orders a fresh one.
Trusted by cold-email teams running
Trusted by cold-email teams running Instantly, Smartlead, Email Bison, MailReach, GlockApps, and Mailmeteor.
MailNurse checks every mailbox all day: where your emails land, blacklists, and warm-up health. Each one gets a simple health score from 0 to 100. The moment one starts to slip, it is paused on its own, so one bad mailbox never drags the rest down.
When a domain is burned out, replacing it by hand takes about ten hours. Mailnurse does the whole job for you while you sleep: it buys a fresh domain, sets up the DNS, creates the mailboxes, connects them to Instantly, and starts warmup. You never touch a thing.
A domain that sends every day wears out. Rotation splits your mailboxes into groups that take turns: some send while the others rest with warm-up still running, then they swap. Your domains stay healthy for longer, so you buy fewer new ones.
Recommended for most fleets
3 of 5 groups send at a time. Each group sends for 3 weeks, then rests for 2 weeks with warm-up still running.
Picture two hundred mailboxes, all keeping themselves healthy. MailNurse retires what is burned and sets up replacements across your Workspaces, so your sending capacity stays steady while you work on your campaigns.
When a sequence stops landing, Mailnurse writes you a fresh one. You get full multi-step copy, checked against 360+ spam triggers, varied so every send looks a little different, personalized with the right details, and ready to push straight to Instantly. Old copy in, clean rewrite out.
Re: FREE growth audit, guaranteed results!!!
quick question about {{companyName}}'s Q3 pipeline
Each feature targets a specific reason emails stop reaching the inbox. Together, they keep your whole setup healthy.
Constant inbox-placement tests, blacklist checks, and warmup vitals, rolled into one health score per account, so you see trouble coming before it hurts.
Learn moreGroups of mailboxes take turns sending while the rest recover with warm-up running. Your domains last longer and stay out of spam.
Learn moreWhen a mailbox lands in spam, a blacklist hits, or warm-up health drops, MailNurse pauses it before the damage spreads, and brings it back once it recovers.
Learn moreWhen a domain burns out, Mailnurse replaces it end to end and starts warmup. The ten-hour job, done for you while you sleep.
Learn moreWhen a single mailbox burns out, Mailnurse retires it and drops in a ready-made persona, with name, photo, and identity, from a pre-warmed pool.
Learn moreWhen a sequence stops landing, Mailnurse writes a fresh one: full multi-step copy, spam-checked against 360+ triggers, and ready to push to Instantly.
Learn moreEvery night MailNurse checks your domains against the spam blacklists and checks SPF, DKIM and DMARC. Anything wrong shows up in Action Items the next morning.
Learn moreMailnurse runs proven warmup schedules, adjusts send volume to engagement, and re-tests placement every night, so your inbox rate stays high on its own.
Learn moreRun cold email for clients? Bring your own Google Workspace and registrar, and pay $2.50 per mailbox instead of $3.
Learn moreConnect your Instantly account with one API key. That is all MailNurse needs to start.
MailNurse watches every mailbox around the clock: where your email lands, blacklists, DNS and warm-up health.
When a mailbox starts to slip, MailNurse pauses it. When a domain burns out, a fresh one is ready to order in one click.
Running cold email for clients? On the Agency plan you can also bring your own Google Workspace and domain registrar.
Pro includes Instantly's inbox placement tests, which cost $97 a month on their own. Try it free for 14 days, no card.
Watch your mailboxes and buy new ones.
No card needed
Your cold email, looked after on autopilot.
Pays for itself
Includes Instantly's inbox placement tests. On their own they cost $97 a month.
No card needed. Moves to Free if you do not keep it.
For agencies running cold email for clients.
Start on the Pro trial and switch any time
Mailboxes $3 a month · Domains $15 once · Your own Instantly, no markup
Works with the stack you already run
Bring your own Instantly and Workspace. Mailnurse connects in a couple of minutes and never touches your keys.
MailNurse watches every mailbox and fixes what breaks, so you can spend your time on campaigns that book meetings.
14 days of Pro free · No card needed · Free plan after
