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OppO
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Build sender reputation before your first cold email

Connect a mailbox and Oppora starts a slow, steady conversation with a network of peer mailboxes. Volume ramps up day by day, peers reply in the thread, and anything that lands in spam is moved back to the inbox.

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4.5 on G24.9 on Capterra

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Trusted by 5,000+ customers

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Warmup on every plan
Free
For as many mailboxes as your plan allows: 3, 25 or 50.
Warmup emails a day per mailbox, at most
20
Starts at 5 by default and ramps up over the days you choose.
Reply rate you set for warmup emails
5-80%
30% by default. Peers answer in the same thread.

Warmup built into the tool that sends your campaigns

A separate warmup tool

Oppora Email Warm-up

Another subscription, billed per mailbox

Included on every plan at no extra cost

Mailboxes connected twice, once for warmup and once for sending

Connect a mailbox once, warm it and send from it

No view of warmup health where you launch campaigns

Mailbox health and warmup stats next to your sending accounts

Volume jumps from zero to full on the first campaign day

A progressive ramp from a few emails a day to your max

How it works

  1. 1

    Connect your mailbox

    Connect Outlook or any mailbox over SMTP and IMAP. Gmail mailboxes connect over SMTP for warmup.

  2. 2

    Choose your settings

    Pick a strategy, daily emails, reply rate, sending days and hours, then press Start Warmup.

  3. 3

    Send campaigns

    Launch campaigns from your warmed mailboxes and keep warmup running alongside them.

Settings you can read in one glance

Progressive starts low and grows to your max over the ramp-up period. Steady holds one volume for mailboxes that are already established. Choose the days and hours warmup runs in your timezone, and change any setting while it runs.

  • 1 to 20 warmup emails a day
  • Ramp-up of up to 60 days
  • Start, pause, resume or stop per mailbox

A health score for every mailbox

Mailbox health is a 0 to 100 score built from your SPF, DKIM and DMARC records, blacklist status, inbox placement and warmup activity. Fix what is missing before you send cold campaigns.

  • SPF, DKIM and DMARC checked for your domain
  • Domain checked against public blacklists
  • Sent, inbox, replied, spam and bounced per day

Keep warming while you send

Warmup does not stop when a campaign starts. Keep it running so your mailboxes keep a steady record of normal, answered email, while campaigns rotate across them.

A mailbox from connect to campaignExample

  1. Mailbox connected

    Outlook, or Gmail and others over SMTP

  2. Warmup starts

    Progressive ramp from 5 emails a day

  3. Found in spam?

    Moved back to the inbox automatically

  4. Ramp-up complete

    Up to 20 warmup emails a day

  5. Campaigns send

    Warmup keeps running alongside

Example flow for illustration.

What teams say

  • “Everything being in one place has made our workflow much simpler. Earlier we had to switch between multiple tools, but now our team can manage leads, campaigns, and replies without jumping between tabs.”
    Gavin Clarke, Sr. People Business Partner, Diligent Robotics
  • “Everything from sending to replies is handled in one system, making it easy for even non-sales teams to use without a steep learning curve.”
    Chenna Vemula, Senior Cloud Security Engineer, Pearson
Start free trialBook a demo

7-day free trial, cancel anytime

How email warmup protects deliverability

What warmup does, how long it takes, and what it cannot fix on its own.

01

Why new mailboxes land in spam

Inbox providers judge a sender by its history. A new mailbox with no sending record that suddenly sends dozens of cold emails looks like a spammer.

Warmup builds that history gradually, with emails that get opened and answered, so providers learn your mailbox is a real sender.

02

How long warmup takes

Plan on about two weeks before a new mailbox sends campaign volume. Older mailboxes with a clean history can usually ramp faster.

Keep warmup running after you start sending, so the positive engagement continues alongside your campaigns.

03

Warmup is one part of deliverability

Warmup handles the engagement signal. Domain authentication with SPF, DKIM and DMARC, clean lists, modest daily volume and good copy matter just as much.

Oppora checks your mailbox DNS setup, verifies emails before you send and reviews campaigns before launch, so the other parts are covered too.

Email Warmup FAQ

Something not covered here? Book a demo and ask us directly.

Warmup is included on every plan

Warmup per mailbox
Free
Mailbox health check
Free
MailboxesFree / Pro / Max
3 / 25 / 50

Pro and Max: warmup for up to 25 mailboxes on Pro and 50 on Max.

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Try it free, no signup

How does Oppora warm up a mailbox?

Your mailbox exchanges emails with a network of peer mailboxes on different providers. Volume starts low and grows each day, peers reply in the same thread at the rate you set, and messages that land in spam are moved back to the inbox.

How long until I can send cold emails?

Plan on about two weeks for a new mailbox. Established mailboxes with a clean history can usually ramp up faster.

What providers are supported?

Outlook and any mailbox that supports SMTP and IMAP. Gmail mailboxes connected through Google sign-in need to be connected over SMTP for warmup.

How many mailboxes can I warm up?

Up to 3 on Free, 25 on Pro and 50 on Max, the same as your plan's mailbox limit. Warmup itself costs nothing extra.

Will warmup stop my emails from going to spam?

It lowers the risk, but it is one part of deliverability. Domain authentication, list quality, sending volume and content matter too, and no tool can promise inbox placement.

Can I pause warmup?

Yes. You can start, pause, resume or stop warmup for each mailbox at any time, and change its settings while it runs.

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