Mailreef review: $249 a server, $0.001 a send, and the limits that size your bill

Mailreef rents each customer a dedicated mail server and IP for $240 a month on a 12-month commitment or $249 month to month, plus $0.001 a send, and lets you create unlimited SMTP/IMAP mailboxes on it. One server is meant for 50,000 cold emails a month, warmup runs in an outside tool, and payments are not refundable. For teams that want their own IP and already run a sequencer it is a clear model; for 12 to a few hundred mailboxes, Outreach2day costs less all in and includes warmup and sending.

Create mailboxesBook a call
  • Warmup and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Monthly cost · 100 mailboxes, sending included

  1. Mailreef + InstantlyMailreef + Instantly: from $650
  2. Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly: $368.67
  3. Outreach2day all-inOutreach2day all-in: $271.67
Price per mailbox
from mailboxes free; $240 a server a month + $0.001 a send
Smallest order
One server: $240 a month on a 12-month commitment or $249 month to month, plus sends
Mailbox types
SMTP
Warmup
No warmup tool of its own: a 1:1 cold-to-warm ratio with an outside tool; the plan grid lists pre-warmed servers, domains and mailboxes, price not published
MCP server
None found

Every line item at 50, 100 and 500 mailboxes

Fit

Who Mailreef fits

Pick Mailreef if

  • You want a dedicated server and IP without running a mail server yourself
  • You send 50,000+ cold emails a month and already use Smartlead or Instantly
  • You want unlimited mailboxes and create them by API
  • You have a warmup tool and can keep a 1:1 cold-to-warm ratio

Look elsewhere if

  • You run fewer than about 50 mailboxes
  • You want warmup and sending in the same subscription
  • You want a free trial, a self-serve start or any refund
  • You need Google Workspace or Microsoft 365 accounts
  • You want to know the domain price before you order

Overview

What Mailreef is

Mailreef is built by Mailreef LLC, part of Dabble Holdings, a Philadelphia startup studio; its about page says the same team started and sold Warmup Inbox. The product is cold email hosting: a mail server and IP that belong to your account alone, domains bought in one click or brought from your registrar, mailboxes created in about 2 minutes each, and SPF, DKIM and DMARC set automatically.

It does not send campaigns or warm mailboxes. Mailboxes connect to Smartlead and Instantly through an integration and to lemlist, Saleshandy, PlusVibe, Snov.io, Mailshake, Close and other tools over SMTP/IMAP, with a help article for each. Warmup comes from your sequencer or a tool such as Warmy, at the 1:1 cold-to-warm ratio Mailreef recommends.

Every customer is screened and approved before access, and new accounts start with a demo rather than a self-serve checkout. The pricing grid also lists pre-warmed servers, domains and mailboxes, with no price published.

A dedicated mail server and IP for cold email with unlimited SMTP/IMAP mailboxes, priced per server plus per send source (opens the vendor's page in a new tab)

Mailreef LLC, a Delaware company and part of Dabble Holdings, a Philadelphia startup studio; the team earlier started and sold Warmup Inbox source (opens the vendor's page in a new tab)

Pricing

Mailreef pricing

What Mailreef charges and what the price includes, next to Outreach2day. Each cell links the page it comes from.

  • Price per mailbox

    Mailreef
    Mailboxes free; $240 a server a month on 12 months or $249 month to month, plus $0.001 a send source (opens the vendor's page in a new tab)
    Outreach2day
    $2.50 a month, warmup, sequencer and analytics included; volume price on a call from 1,000 mailboxes details

  • Smallest order

    Mailreef
    One server: $240 a month on a 12-month commitment or $249 month to month, plus sends source (opens the vendor's page in a new tab)
    Outreach2day
    12 mailboxes, $30 a month details

  • Domain cost

    Mailreef
    Bought in one click at a price not published, or bring your own source (opens the vendor's page in a new tab)
    Outreach2day
    $13 a year for a .com, $5 for a .info, registered to you; or connect your own for free details

  • Setup fees

    Mailreef
    None published source (opens the vendor's page in a new tab)
    Outreach2day
    No setup or platform fee; a card fee of 2.9% + $0.30 at checkout on new domains and the first month details

  • Warmup

    Mailreef
    Not includedNo warmup tool of its own: a 1:1 cold-to-warm ratio with an outside tool; the plan grid lists pre-warmed servers, domains and mailboxes, price not published source (opens the vendor's page in a new tab)
    Outreach2day
    IncludedIncluded for the life of the mailbox, 75+ warmup emails a day details

  • Sequencer

    Mailreef
    Smartlead and Instantly integration; SMTP/IMAP guides for lemlist, Saleshandy, PlusVibe, Snov.io, Mailshake, Close and others source (opens the vendor's page in a new tab)
    Outreach2day
    IncludedIts own sequencer; syncs to Instantly and Smartlead, CSV export for 14 tools details

  • Export to other tools

    Mailreef
    IncludedSmartlead and Instantly integration; SMTP/IMAP logins for any other tool source (opens the vendor's page in a new tab)
    Outreach2day
    IncludedSyncs to Instantly and Smartlead by API key; CSV export in the import format of 14 tools, EmailBison among them; SMTP/IMAP logins for any other tool details

  • API and MCP

    Mailreef
    Not includedDeveloper API and Zapier on all plans; docs not public. MCP: None found source (opens the vendor's page in a new tab)
    Outreach2day
    IncludedREST API on every account. MCP: Hosted MCP server: domains, mailboxes, warmup, campaigns, replies details

List prices from Mailreef's pricing page and Outreach2day's pricing page, checked . Taxes and card fees excluded.

Add-ons and extra costs

The bill has two parts. The server is $240 a month on the Agency plan with a 12-month commitment, or $249 on Agency Flex, month to month; Enterprise is quoted. On top, every send costs $0.001, which is $1 per 1,000. Mailboxes are free and unlimited, so the price per mailbox depends on how many you put on a server.

Sending volume sets how many fit. Mailreef recommends 150 mailboxes a server, 50 emails per mailbox a day at most and 3 mailboxes per domain, and its help center caps a server at 50,000 cold and 50,000 warmup emails a month. At 25 cold emails a day that is about 90 mailboxes a server; at 50 a day, about 45. Above the cap the help center says to add a server.

Outreach2day is $2.50 a mailbox from 12 with warmup and its own sequencer in the price, month to month, and a quoted volume price from 1,000 mailboxes.

Full cost

What 50, 100 and 500 Mailreef mailboxes cost a month

Mailreef at its list price with the Instantly plan it needs to send and warm up, next to Outreach2day mailboxes in Instantly and Outreach2day on its own.

50 mailboxesUSD a month
  1. Mailreef + InstantlyMailreef + Instantly: from $373.50
  2. Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly: $232.83
  3. Outreach2day all-inOutreach2day all-in: $135.83
100 mailboxesUSD a month
  1. Mailreef + InstantlyMailreef + Instantly: from $650
  2. Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly: $368.67
  3. Outreach2day all-inOutreach2day all-in: $271.67
500 mailboxesUSD a month
  1. Mailreef + InstantlyMailreef + Instantly: from $2,127
  2. Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly: $1,716.33
  3. Outreach2day all-inOutreach2day all-in: $1,358.33
  • Mailreef + Instantly

    SMTP (dedicated server) mailboxes at 25 cold emails a day each, Instantly for sending and warmup

    50 mailboxes

    from $373.50a month

    at least $237.67 more than Outreach2day all-in

    from $7.47 per mailbox · from $13.58 per 1,000 emails · 1,250 emails a day

    100 mailboxes

    from $650a month

    at least $378.33 more than Outreach2day all-in

    from $6.50 per mailbox · from $11.82 per 1,000 emails · 2,500 emails a day

    500 mailboxes

    from $2,127a month

    at least $768.67 more than Outreach2day all-in

    from $4.25 per mailbox · from $7.73 per 1,000 emails · 12,500 emails a day

  • Outreach2day mailboxes + Instantly

    Keep Instantly, buy the mailboxes from us; 25 a day each

    50 mailboxes

    $232.83a month

    $97 more than Outreach2day all-in

    $4.66 per mailbox · $8.47 per 1,000 emails · 1,250 emails a day

    100 mailboxes

    $368.67a month

    $97 more than Outreach2day all-in

    $3.69 per mailbox · $6.70 per 1,000 emails · 2,500 emails a day

    500 mailboxes

    $1,716.33a month

    $358 more than Outreach2day all-in

    $3.43 per mailbox · $6.24 per 1,000 emails · 12,500 emails a day

  • Outreach2day all-in

    Mailboxes, warmup and our sequencer in one bill; 25 a day each

    50 mailboxes

    $135.83a month

    $2.72 per mailbox · $4.94 per 1,000 emails · 1,250 emails a day

    • 50 mailboxes at $2.50, warmup and sequencer included: $125
    • 10 domains at $13 a year: $10.83
    100 mailboxes

    $271.67a month

    $2.72 per mailbox · $4.94 per 1,000 emails · 2,500 emails a day

    • 100 mailboxes at $2.50, warmup and sequencer included: $250
    • 20 domains at $13 a year: $21.67
    500 mailboxes

    $1,358.33a month

    $2.72 per mailbox · $4.94 per 1,000 emails · 12,500 emails a day

    • 500 mailboxes at $2.50, warmup and sequencer included: $1,250
    • 100 domains at $13 a year: $108.33

Monthly list prices on monthly billing. Sending volume = mailboxes × emails per mailbox a day (Mailreef: 25, as ours; Mailreef allows up to 50, and one server per 50,000 cold emails a month; Outreach2day: 25) × 22 sending days; the Instantly plan is the cheapest one that covers it. Mailreef does not publish a domain price, so its domains (3 mailboxes each) are left out of the total, marked "from"; Outreach2day .com domains at $13 a year, 5 mailboxes per domain. Domains spread over 12 months. Above 1,000 mailboxes Outreach2day prices on a call.

The table sends 25 cold emails per mailbox a day on both sides. At 100 mailboxes that is 55,000 a month, past one server's 50,000, so Mailreef needs two: from $650 a month with Instantly, before domains. At 500 mailboxes it is six servers and from $2,127.

Mailreef does not say whether warmup sends count toward the $0.001 fee; the table prices cold sends only, so the real bill can be higher.

What Mailreef does well

  • A mail server and IP that no other customer sends from
  • Unlimited mailboxes on a server at no extra cost
  • Server insights: blacklist status, a bad-copy score and sends per box
  • Smartlead and Instantly integration, plus SMTP/IMAP guides for lemlist, Saleshandy, PlusVibe and more

Verdict

Mailreef is a good fit for an agency that sends tens of thousands of cold emails a month, wants an IP of its own and already pays for a sequencer and a warmup tool. At 90 mailboxes on one server the server and sends come to about $300 a month before the sequencer.

For 12 to a few hundred mailboxes the server is the expensive part. 50 mailboxes on Mailreef with Instantly are from $373.50 a month; on Outreach2day they are $135.83 with warmup, our sequencer and 10 domains included.

Your size

What 100 mailboxes cost a month

121,000+
  • Mailreef + InstantlyMailreef + Instantlyfrom $650

    2,500 cold emails a day

  • Outreach2day mailboxes + InstantlyOutreach2day mailboxes + Instantly$368.67

    2,500 cold emails a day

  • Outreach2day all-inOutreach2day all-in$271.67

    2,500 cold emails a day

Outreach2day all-in is $378.33 a month less than Mailreef + Instantly ($4,540 a year), with warmup and the sequencer in the price.

Create 100 mailboxes

Switching

Moving from Mailreef to Outreach2day

  1. Keep your sequencer

    Connect Instantly or Smartlead in Outreach2day with an API key and the warm mailboxes are added to your account; other tools take a CSV in their import format, or SMTP/IMAP logins. How the export works

  2. Or move the campaigns

    Our sequencer runs campaigns with steps, a send schedule, stop on reply and one inbox for replies; import the contacts as a CSV and recreate the steps. The mailbox price stays $2.50.

  3. Warmup and the overlap

    New mailboxes warm for 14 days before cold email, and warmup keeps running after that. Keep the Mailreef mailboxes sending during those two weeks, then shift the volume and cancel Mailreef for the end of its billing period.

Agency Flex can be stopped at the end of any month; the Agency plan runs 12 months. Nothing is refunded, and after a downgrade servers or IPs cannot be added back for 120 days.

Terms

Mailreef limits, setup and terms

Each line links to the vendor's page it comes from.

Smallest order

source (opens the vendor's page in a new tab)
One server: $240 a month on a 12-month commitment or $249 month to month, plus sends

Setup time

source (opens the vendor's page in a new tab)
Mailboxes in one click, about 2 minutes; every customer is screened and approved first

Mailbox types

source (opens the vendor's page in a new tab)
SMTP/IMAP on a dedicated server and IP

Domains

source (opens the vendor's page in a new tab)
Your own or bought in one click, price not published; 3 mailboxes per domain at most

Sending limits

source (opens the vendor's page in a new tab)
50 emails per mailbox a day at most; per server up to 50,000 cold and 50,000 warmup emails a month

Warmup

source (opens the vendor's page in a new tab)
Not included No warmup tool of its own: a 1:1 cold-to-warm ratio with an outside tool; the plan grid lists pre-warmed servers, domains and mailboxes, price not published

Sequencers

source (opens the vendor's page in a new tab)
Smartlead and Instantly integration; SMTP/IMAP guides for lemlist, Saleshandy, PlusVibe, Snov.io, Mailshake, Close and others

API

source (opens the vendor's page in a new tab)
Partly, or at extra cost Developer API and Zapier on all plans; docs not public

MCP server

source (opens the vendor's page in a new tab)
Not included None found

Support

source (opens the vendor's page in a new tab)
Live technical support and a deliverability consulting chat

Refunds

source (opens the vendor's page in a new tab)
None: the terms say payments are not refundable under any circumstances

Trial

source (opens the vendor's page in a new tab)
No free trial; a free demo

Features

Other Mailreef features

Dedicated server and IP
Every customer gets its own mail server and IP address; no shared resources or rotating IPs source (opens the vendor's page in a new tab)
Server insights
Outbound volume, blacklist status, a bad-copy score, sends per box and boxes per domain, per server source (opens the vendor's page in a new tab)
Moving mailboxes in
Google or Outlook mailboxes can move to Mailreef by changing MX records; they need 14 to 30 days of warmup again source (opens the vendor's page in a new tab)
Scale (vendor's claim)
100M+ emails sent a month, 0 blocked mailboxes, 99.9% server uptime source (opens the vendor's page in a new tab)

In detail

Mailreef pros and cons

Pros, from Mailreef's own pages: a dedicated server and IP per customer, so no shared sending reputation; unlimited free mailboxes; one-click domains and mailboxes with DNS set for you; server insights for blacklist status, a bad-copy score, sends per box and boxes per domain; live technical support with a deliverability chat; an API and Zapier for mailbox creation; and a month-to-month plan.

Cons: a server costs the same with 10 mailboxes or 150, so small setups pay a high price per mailbox; warmup and sending need other tools; domain and pre-warmed prices are not published; there is no free trial or self-serve checkout; nothing is refunded; and after a downgrade you cannot add servers or IPs back for 120 days.

The terms that matter

Section 28 of the terms says payments "shall not be refundable under any circumstances". Section 29 adds a 120-day cooling-off period: after you reduce servers or IPs, you cannot raise them above the new level for 120 days, unless Mailreef grants an exception in writing.

Domains you buy through Mailreef are purchased on your behalf, and the terms authorise Mailreef to bill subscription and usage fees, sends included, to the card on file. The company is Mailreef LLC, a Delaware limited liability company, and disputes go to arbitration under Delaware law.

Moving mailboxes to or from Mailreef

To move Google or Outlook mailboxes in, you add the domain to Mailreef and change its MX and DNS records; the old mailboxes stop working the moment MX moves, and old emails are not copied. Mailreef's help center says the moved mailboxes need 14 to 30 days of warmup again, because the sending IP is new.

The same holds in the other direction. Leaving Mailreef for another provider means a new sending IP and a new warmup, so run the new mailboxes on new domains while the Mailreef server keeps sending. The options side by side are on Mailreef alternatives.

Ratings

Mailreef ratings

Trustpilot had no page for mailreef.com on 2026-10-08, and G2 did not load for us.

Or us

Mailreef or Outreach2day

We sell cold email mailboxes too. Where our product fits this buyer and where it does not.

Mailreef

Stay with Mailreef if

  • You need a dedicated server or IP of your own
  • You want more than 25 cold emails per mailbox a day

Outreach2day

Outreach2day fits if

  • You run 1,000+ mailboxes: we quote a volume price below every vendor list price in our comparisons, warmup and sending included
  • You want mailboxes, warmup and the sequencer in one bill at $2.50 a mailbox, 12 minimum
  • You run 12 to a few hundred mailboxes: our all-in price is below Mailreef servers, sends and a sequencer at the same volume
  • You keep Instantly or Smartlead: our mailboxes sync by API key, and EmailBison or 11 more tools take a CSV
  • You want a REST API and an MCP server for domains, mailboxes, warmup and campaigns
Create mailboxesBook a call

Outreach2day mailboxes send from its own campaigns or from your sequencer; the fields and settings per tool are in the integration docs.

FAQ

Mailreef review: questions

How much does Mailreef cost?

$240 a month per dedicated server on the Agency plan with a 12-month commitment, or $249 month to month on Agency Flex, plus $0.001 a send ($1 per 1,000). Mailboxes are free and unlimited. Enterprise is quoted, and domain prices are not published.

How many mailboxes and emails does a Mailreef server handle?

A server can hold unlimited mailboxes; Mailreef recommends 150. The help center caps a server at 50,000 cold and 50,000 warmup emails a month and recommends at most 50 emails per mailbox a day and 3 mailboxes per domain.

Does Mailreef include warmup?

No. Mailreef recommends a 1:1 ratio of cold to warmup emails from an outside tool or your sequencer, and has help guides for tools such as Warmy. Its pricing grid lists pre-warmed servers, domains and mailboxes without a price.

Does Mailreef have a free trial or refunds?

No free trial; it offers a free demo, and every customer is screened before access. Its terms say payments are not refundable under any circumstances.

Which sequencers work with Mailreef?

Smartlead and Instantly through an integration, and any tool that takes SMTP/IMAP logins: the help center has guides for lemlist, Saleshandy, PlusVibe, Snov.io, Mailshake, Close and others.

Who owns Mailreef?

Mailreef LLC, a Delaware limited liability company and a Dabble Holdings company. Its about page says the team earlier started and sold Warmup Inbox.

Related

More on Mailreef

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warmup and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warmup and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

Sources

Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

Mailreef
Outreach2day

Full volume from day 14: 25 cold emails a mailbox a day

Add domains, create mailboxes and turn on warmup. You see every mailbox's warmup numbers from day one.

Book a call
Create mailboxes$2.50 a mailbox, all in