Outreach on email
Multi-step campaigns across all of your mailboxes, with sending spread out so nothing goes out in a burst.
Outreach on email, LinkedIn, texts and iMessage
Lands in the inbox. Books the meetings.
Mailboxer runs your outreach, warms up and watches every mailbox, and puts every reply in one inbox. Then Reply Agent answers those replies like your best rep and books the meetings for you.
14-day free trial on every paid plan Or stay on Free: 5 mailboxes, no card needed
mailboxerToday
Good morning. Yesterday you sent 1,284 emails and got 41 replies, 9 interested.
Q4 Founders
18 repliesOps Leaders
14 repliesAgency Partners
9 repliesLogistics CFOs
7 repliesMailbox health15 healthy 2 warming 1 resting
Video tour
Watch the 90-second tour.
See a campaign go from connected mailboxes to booked meetings.
Features
One place for all of your outreach.
Email, LinkedIn, texts and iMessage run from the same campaigns, and every reply lands in one inbox.
LinkedIn tools
Connect HeyReach, Expandi, PhantomBuster, Skylead, Dripify or Waalaxy, or add manual LinkedIn task steps.
Texts and iMessage
Add text and iMessage steps to a sequence, right next to your emails.
Voice notes and AI bots
Send voice notes and let your own AI bots run steps in your workflows.
One inbox for every reply
Email, LinkedIn and text replies, texts included, all land in Unibox. Answer from the same thread.
Warm-up with a ramp you control
Built in. It ramps up on its own, or switch to Advanced on a paid plan and set the start, the step up and the top speed yourself.
A/B tests and lead time zones
Test the subject and body of every step. Emails go out in business hours in each lead's own time zone.
Health scores with auto-recovery
Every mailbox, domain and IP gets a health score. When one struggles, Recovery Mode pulls it, re-warms it and swaps in a fresh one.
A full API for your AI agent
Your own AI agent can set up and manage campaigns: create them, upload leads, write sequences, connect mailboxes and read replies. Webhooks and MCP included.
Reply Agent
Your best rep, on every reply.
Agencies used to hire people just to answer client replies. Reply Agent does that job. It reads every reply, answers like your best rep, and gets the meeting on the calendar while your team sleeps.
- Handles every replyInterested, curious, not-now and objections, across every mailbox and campaign.
- Books meetings around the clockSends your calendar link and keeps the thread going until the meeting is booked.
- Follows your rulesYou decide what it can say, what it never promises and when it hands off to a person.
- Knows your companyGive it your offer, your proof points and your answers to the usual questions.
- Your tone, your dos and don'tsFormal or relaxed, short or detailed. It writes the way you want it to.
- Answers like your best repClear, quick and on point, so warm leads don't go cold waiting for a reply.
Reply Agent is an add-on for paid plans, from $19 a month for 500 replies. Reply sorting and interested-reply alerts are on every plan.
FL
Dana at Fernhill LabsRe: Quick question about Q4
InterestedSounds interesting. What would this look like for a team of 12, and can we talk next week?
Reply Agent is writing
Hi Dana, for a team of 12 most of the setup is done in the first call. Here's my calendar, pick any time that suits you: cal.example/meet
Booked Thursday 10:30.
Meeting booked · Thu 10:30 AM
Rules followedTone: friendlyCalendar linkNo discounts
Deliverability
Built to protect your sender reputation.
Most sending tools fire off email and leave the clean-up to you. Mailboxer keeps watching after you hit launch.
Every mailbox, on one health line.
LT
TC
DV
PG
+13
SK
Needs restWarmingHealthy
sam@ is resting after a bounce spike.
Built-in warm-up
New mailboxes start slowly and build up volume, so inbox providers learn to trust them before your campaigns lean on them. Paid plans can set their own ramp.
Blocklist monitoring
Every IP and domain you send from is checked against blocklists, so a listing doesn't go unnoticed for weeks.
Automatic Recovery Mode
When a mailbox starts to struggle, Mailboxer acts on its own instead of waiting for you to notice.
- Spot itHealth score drops
- Pull itOut of rotation
- Re-warm itBack to warm-up
- Replace itA fresh mailbox steps in
Sends in each lead's own time zone
Emails go out 9 AM to 5 PM where each lead lives, worked out from their city, country or phone area code.
New York
Chicago
Los Angeles
9 AM ET3 PM ET9 PM ET
Mailboxes and leads, inside Mailboxer
Everything you need to launch.
Buy ready-to-send mailboxes and find your leads without leaving the app.
Ready-to-send mailboxes from $2 down to $1 each.
Buy Spinbox mailboxes inside Mailboxer and add them straight to your campaigns. The more you buy, the lower the price of every mailbox in the order.
$1.80 per mailbox, $180 a month
| Mailboxes | Per mailbox, monthly |
|---|---|
| 15 to 99 | $2.00 |
| 100 to 299 | $1.80 |
| 300 to 499 | $1.60 |
| 500 to 599 | $1.40 |
| 600 to 699 | $1.25 |
| 700 to 799 | $1.13 |
| 800 to 859 | $1.06 |
| 860 to 899 | $1.02 |
| 900 and up | $1.00 |
Spinbox mailboxes are billed on their own, not as part of Mailboxer plan prices. Starts at 15 mailboxes. Need mailboxes? Spinbox, from $1 →
Find leads in the app.
Search for the people you want to reach with ProspectData, right inside Mailboxer, and add them to a campaign in a few clicks.
Everything in Mailboxer
Every feature, in one place.
Here's the full list, grouped so it's easy to scan.
Mailboxes and sending
- Mailboxes by plan: 5 on Free, 50 on Pro, 250 on Scale, unlimited on Unlimited and Agency
- Bring your own mailboxes: Google Workspace, Microsoft 365, Outlook or any SMTP and IMAP account
- Or buy ready-to-send Spinbox mailboxes inside Mailboxer
- Add mailboxes one by one or in bulk from a CSV, with a connection test
- Mailbox passwords are stored encrypted
- Sending limits per mailbox, spread out so nothing goes out in a burst
- Built so the same email is never sent twice, even after a restart
Campaigns and sequences
- Multi-step sequences with a wait between steps
- A/B test the subject and body of every step
- Merge fields and spintax
- Sends 9 AM to 5 PM in each lead's own time zone
- Works out each lead's time zone from their city, country or phone area code
- Stops the sequence when someone replies. Out-of-office notes don't stop it
- Text, iMessage and LinkedIn steps alongside email
- Turn any campaign on or off with one switch
Warm-up
- Built-in warm-up for every mailbox
- Automatic ramp by default
- Advanced ramp on paid plans: set the starting volume, the step up and the maximum for one mailbox or many
- Warm-up emails get opened, flagged, moved out of spam and sometimes replied to
- Runs during each mailbox's own business hours
- Warm-up reports: inbox, spam and promotions, split by Google, Microsoft and others
Deliverability and protection
- A health score for every mailbox, domain and sending IP
- Regular blocklist checks on Spamhaus, Barracuda, SpamCop and UCEPROTECT
- SPF, DKIM, DMARC and MX checks, with a re-check button
- Inbox placement tests across Google, Microsoft and other providers
- Google Postmaster Tools and Microsoft SNDS data in one place
- Recovery Mode pulls a struggling mailbox, re-warms it and moves its sends to healthy ones
- Pauses a mailbox or domain on its own when bounces climb too high
- Your own tracking domain, with free automatic SSL
- Open and click tracking stay off unless you turn them on
Unibox: every reply in one inbox
- Email, LinkedIn and text replies land in one inbox
- Answer in the same thread, from the same mailbox
- Labels, search, unread only, and filters by campaign, mailbox or teammate
- Save your favorite filters and come back to them in one tap
- Auto-replies, out-of-office notes and bounces are sorted out for you
- Your replies don't count against your sending limits
AI that does the busywork
- Reply Agent: answers your replies and books meetings, following your rules
- Reply sorting: every reply tagged as interested, not interested, out of office and more
- Instant alerts the moment someone says yes
- Copy grading before you launch: flags spam words, risky links and weak lines
- AI reply drafts, ready for you to check and send
- AI first lines, including ones based on research about each lead's website
- Lead research cards, so you know who you're writing to
Analytics
- Sent, replies, positive replies, bounces, unsubscribes and opens
- Broken down by account, campaign, step, A/B version and mailbox
- Filter by date, tag, domain, sender and the lead's email provider
- Put a dollar value on positive replies to see each campaign's pipeline
- Export to CSV
Leads and compliance
- Find leads with ProspectData inside the app
- Import leads from a CSV and match your columns. Duplicates removed automatically
- One do-not-contact list across every campaign
- One-click unsubscribe in every email, plus your business address for CAN-SPAM
- Hard bounces removed automatically. Soft bounces get retried first
- Move your campaigns and leads over from Instantly, Smartlead or QuickMail
Teams, agencies and API
- Separate workspaces for each team or client
- White-label client workspaces with your logo, colors and app address on Agency plans
- A full API, so your own AI agent can set up and manage campaigns
- Webhooks, and MCP for AI assistants
- Send positive replies to your CRM, such as HubSpot and Pipedrive
- Alerts in the app, by email or by webhook when Recovery Mode steps in
Pricing
Simple plans. 14 days free.
Pick a plan for your volume. Every paid plan starts with a 14-day free trial, billed when the trial ends. Save 20% when you pay yearly.
Free
$0/mo
Free for as long as you like
Start free- 5 mailboxes
- 2,000 emails/mo
- Automatic warm-up
- Unibox and reply sorting
- Interested-reply alerts
- Health scores and Recovery Mode
Pro
$25/mo
Billed monthly
Start 14-day free trial14-day free trial. Billed when the trial ends.
- 50 mailboxes
- 25,000 emails/mo
- 300 free AI credits/mo
- Advanced warm-up ramp
- Everything in Free
- Reply Agent add-on
Scale
$59/mo
Billed monthly
Start 14-day free trial14-day free trial. Billed when the trial ends.
- 250 mailboxes
- 150,000 emails/mo
- 750 free AI credits/mo
- Advanced warm-up ramp
- Everything in Pro
- Reply Agent add-on
Unlimited
$199/mo
Billed monthly
Start 14-day free trial14-day free trial. Billed when the trial ends.
- Unlimited mailboxes
- 500,000 emails/mo
- 2,000 free AI credits/mo
- Advanced warm-up ramp
- Everything in Scale
- Reply Agent add-on
Agency
$79/mo
Billed monthly
Start 14-day free trial14-day free trial. Billed when the trial ends.
- 10 client workspaces
- Unlimited mailboxes
- 150,000 emails/mo
- 1,000 free AI credits/mo
- White-label and full API
- Extra clients $5/mo each
Need mailboxes? Add Spinbox mailboxes from $1 each, bought inside Mailboxer and billed separately from your plan.
Reply Agent autopilot
Add to any paid plan. Billed monthly and renews automatically until you turn it off.
- 500 replies/mo$19
- 2,000 replies/mo$59
- 6,000 replies/mo$169
Email packs
Extra emails, valid to the end of the month.
- 25k$14
- 50k$24
- 100k$44
- 250k$95
- 500k$170
- 1M$300
AI credit packs
Valid for 12 months.
- 1,000 credits$9
- 5,000 credits$39
- 15,000 credits$99
- 50,000 credits$319
What credits buy
Credits are only used when you run an AI action.
- AI first line6
- First line with website research10
- Research card8
- AI reply (premium)5 (16)
Upgrades take effect right away and are prorated. Downgrades take effect at the end of your paid term. Prices in USD.
What is Mailboxer?
An outreach platform. You connect or buy mailboxes, build campaigns across email, LinkedIn, texts and iMessage, and Mailboxer sends them, warms up your mailboxes, watches their health and collects every reply in one inbox. Reply Agent can answer those replies and book meetings for you.
How many mailboxes can I connect?
It depends on your plan: 5 on Free, 50 on Pro and 250 on Scale. Unlimited and every Agency plan have no mailbox cap.
What does Reply Agent do?
It reads every reply, answers it the way you've told it to, and sends your calendar link to book the meeting. You set its rules, company details, tone and dos and don'ts. It's an add-on for paid plans, from $19 a month for 500 replies.
Where do I get mailboxes?
Bring your own Google Workspace, Microsoft 365 or SMTP mailboxes, or buy ready-to-send Spinbox mailboxes inside Mailboxer, from $2 down to $1 each depending on how many you buy.
When do emails go out?
9 AM to 5 PM in each lead's own time zone, worked out from their city, country or phone area code.
What does Recovery Mode do?
When a mailbox starts to struggle, Recovery Mode takes it out of rotation, puts it back through warm-up and swaps in another mailbox so your campaign keeps going.
How much does it cost?
Free is $0 with 5 mailboxes. Pro is $25 a month ($20 a month billed yearly), Scale is $59 ($47 yearly) and Unlimited is $199 ($159 yearly). Agency plans start at $79 a month ($63 yearly). Extra emails come in packs from $14 for 25,000, and Spinbox mailboxes are billed separately, from $2 down to $1 each. See Pricing for everything each plan includes.
Is there a free trial?
Yes. Every paid plan starts with a 14-day free trial. Nothing is due today, and you're billed when the trial ends unless you cancel before then. The Free plan stays free for as long as you like.
How does billing work?
Free costs nothing. Paid plans are billed monthly or yearly, and yearly saves 20%. Upgrades take effect right away and are prorated. Downgrades take effect at the end of your paid term.
Can my own AI agent run Mailboxer?
Yes. The full API lets your agent create campaigns, upload leads, write sequences, connect mailboxes and read replies. Webhooks and MCP are included.
14-day free trial on every paid plan
Run more campaigns. Burn fewer mailboxes.
Sign up in a couple of minutes and try any paid plan free for 14 days. Or stay on Free as long as you like.