First Time Warming Up Your Email? Here Is Exactly What to Expect

If you have just connected a mailbox to warm-up, you will start seeing short emails between your own addresses within the first hour: a quick question about a meeting, a thank-you, some notes. They look random because they are meant to look like ordinary office mail. Nothing is wrong, nobody is waiting for a reply, and nothing has been sent to anyone outside your account. This page shows what the emails look like, why each piece of the process exists, what the engine touches in your inbox, and how to read the numbers on the dashboard.

What you will see in the first hour

Within 15 minutes of your second mailbox joining, the first email goes out. By the end of the first day each mailbox has sent about three and received about three. They arrive marked read and filed under a Warm-up label within an hour of landing, and after a day they are archived so your inbox stays clean. Here is a real example of the kind of email you will see.

And a reply the engine wrote a little later in the same thread:

That is the whole content. Plain text, first names, no links, no images, no tracking, nothing about your business. It reads like two colleagues because that is exactly the pattern mailbox providers trust.

Why your mailboxes email each other

Providers such as Gmail decide whether to trust a sender from what happens to its mail: is it opened, replied to, left in Spam, or pulled out of Spam. A brand-new mailbox has no history, so its first real campaign would be judged on nothing. Warm-up builds that history on purpose, and it needs both sides: one mailbox to send and another, that you also control, to receive and respond. That is why the emails are between your own addresses, and why you need at least two mailboxes connected.

The engine uses a private pool: only mailboxes under your account write to each other. No stranger's inbox ever sees your addresses, and nothing is ever sent to a real contact. If you want the full mechanics, read what is an email warm-up network.

What the engine does inside your inbox, and what it never does

It does:

• send a slowly growing number of warm-up emails each day, within business hours in your time zone;
• find its own warm-up emails that arrived from your other mailboxes;
• move any that landed in Spam back to the inbox;
• mark them read and file them under the Warm-up label;
• reply to roughly 40% of them inside the same thread;
• archive them after about a day.

It never does:

• read, move, archive or reply to any email it did not generate itself. Its own emails carry a hidden header and that is the only thing it looks for;
• send to anyone outside your connected mailboxes;
• use links, images or your business content in warm-up mail.

The exact promises are written into our privacy policy, and the engine's behaviour is described in full on the strategy page.

The first two weeks, day by day

If you see a spam rate of 50% on day one, do not panic. One rescued email out of two received is 50%. It is the trend over the week that matters, and the timeline is in how long does email warm up take.

Reading the dashboard

• Warming · day N means the mailbox is active and on day N of its ramp.
• Today 4 / 7 means it has sent 4 of the 7 emails allowed today. It will not exceed the allowance.
• Received 7d and Rescued 7d are counts for the last week. Rescues falling toward zero is the goal.
• Spam rate is how much of this mailbox's mail your other mailboxes found in Spam over 7 days. It belongs to the sender, because it is the sender's reputation being measured.
• Health rolls spam rate, errors and deliveries into one score: Healthy at 85 and above, Watch from 60, At risk below 60, Blocked when the login or permission has failed.
• Needs permission means the mailbox was connected without the box that lets the engine read and organise mail. Press Reconnect and tick it.

Things you can safely do

• Leave the warm-up emails alone. Reading them, deleting them after archive, or replying yourself all do no harm.
• Pause a mailbox from the dashboard any time; the ramp resumes where it left off.
• Rename a mailbox so greetings use the right first name. Real names help.
• Set a lower daily cap for a brand-new domain in its first week.
• Keep warm-up running at a lower cap once you start real outreach.

When to start real sending

When the card says Ready for outbound, start with 20 to 30 real emails a day per mailbox and keep warm-up ticking underneath at 10 to 15. If the spam rate climbs above 5% during a campaign, pause the campaign for a few days and let the warm-up recover it. Everything else about running the first campaign without a budget is in free email campaign tools.

Frequently asked questions