A brand-new sending mailbox that suddenly blasts hundreds of cold emails looks exactly like a compromised account to a mailbox provider. Laureo prevents that with a managed ramp: each mailbox starts at a conservative daily volume and steps up through a fixed schedule of three stages as its connection ages. The ramp is automatic. You do not configure it, and you cannot push a mailbox past its current stage.

Each campaign carries its own optional Daily send limit for this campaign, set in the sequence's settings. It caps the emails that one campaign sends in any rolling 24 hours, totaled across every mailbox that campaign rotates through. Two details matter: the window is a rolling 24 hours, not a calendar day, so it does not reset at midnight, and follow-ups count against it alongside first touches. Leave it blank (the field reads “No limit”) and the campaign has no limit of its own, so it sends as fast as the mailboxes and the ramp allow.

Because the limit is per campaign, you can run several campaigns at different paces at once: give a priority campaign a higher limit and a background campaign a lower one. One caveat: campaigns that share a mailbox share that mailbox's daily budget, so two campaigns sending through the same mailbox draw from the same per-mailbox allowance rather than each getting a full one.

Alongside the daily send limit, a campaign's settings carry three controls that shape its first-touch volume and its ordering. They pace how a campaign opens new conversations without touching the follow-ups already in flight.

Sends are placed inside each recipient's business hours, computed from their timezone, so your email arrives when a person is actually at their desk rather than at 3 a.m. their time. Within the window, Laureo adds jitter, randomized spacing between sends, so a mailbox never fires a burst of identical-looking messages on a fixed cadence. The result reads like a person sending one email at a time, not a machine.

The spacing is stated, not hidden. Under Mailboxes in Cold Outreach settings you will find the exact band: Emails from one mailbox go out 90 to 140 seconds apart, at random, so your sending never settles into a fixed cadence. That band is the floor, and 90 seconds is the lowest value anything can ask for: a campaign can only make a mailbox slower, never faster. Each campaign carries its own minimum time between emails from the same mailbox, anywhere from 90 seconds to 30 minutes, and new campaigns start at 2 minutes. The number you set is a minimum, not a fixed cadence: Laureo adds a random extra of up to half again on top of every wait.

All of this is measured per mailbox. Different mailboxes send independently of each other, because each one carries its own sender reputation and is judged on its own sending pattern, so two of your mailboxes can send at the same moment without either of them looking rushed.

A launched sequence tells you in words when its first email leaves, and why it waits when it waits. See When Sequences Start Sending for the send window, the fallback timezone, scheduling a start date, and the reason shown on a held lead.

Some days you would rather not land in a cold inbox at all, such as public holidays. Under Cold Outreach settings, the Skip dates card holds an org-wide list of days cold outreach should not send. A send that would otherwise fall on a skip date is deferred to the next day inside its send window, evaluated in the recipient's timezone, so the message waits for the next legal opening instead of going out on the blackout day. Until it sends, the row stays pending and makes no forward progress.

Each campaign can override the org list. In the sequence builder's schedule, the Skip dates field starts empty, which inherits your organization's list; add a date there and this campaign uses its own list of blackout days instead, leaving every other campaign on the org default.

Laureo also paces by recipient root domain. Sending too many messages too quickly to the same company domain looks like an attack to that company's mail server, so volume to any single root domain is spaced out. A higher-volume threshold (around 5,000 messages per day to one root domain) applies to large consumer domains. This keeps you from tripping a recipient organization's own rate defenses.

Mail often lands more reliably when the sending mailbox and the recipient sit on the same email provider. When capacity allows, Laureo prefers a first-touch send from one of your mailboxes hosted on the recipient's own provider. This is automatic, with nothing to configure, and it never holds a send: when no matching mailbox has room, or the recipient's provider cannot be determined, sending falls back to the normal rotation across your pool. It only ever changes which mailbox inside its budget sends the email, never whether the email goes out.

Laureo watches each mailbox's rolling bounce rate. If it climbs above 2%, the mailbox is automatically paused for new cold sends. A high bounce rate is the fastest way to get a domain blacklisted, and pausing early protects the mailbox. Replies still send while a mailbox is paused; only new cold steps hold. You resolve the cause (usually a stale slice of your list, or addresses that were never accurate) and resume. See Troubleshooting for the resume flow.

Open tracking is off by default on every cold sequence, and for cold outbound we recommend leaving it off. Open tracking adds a tracking pixel to each email, and two things work against it. The numbers are unreliable, because image-blocking and automated link-and-image scanning fire opens that no human ever made. And the extra tracking can itself weigh on deliverability. The signal that actually predicts pipeline is the reply, so track replies and let opens stay off. See Analytics for why reply rate is the headline metric.

Tracking needs a host to put the links on, and which host that is depends on your setup. Today there is no standard tracking host, and the flow for adding a tracking domain of your own is not switched on either, so open and click tracking cannot be turned on for a sequence and the two switches on the sequence stay inert. Once a tracking domain you own is verified, tracked links and the unsubscribe header run on it. The Custom tracking domain card, at the top of Cold Outreach settings, always states which of these you are in rather than leaving you to infer it from a form. It shows one of five states, and today every organization is in the first.

Only a teammate with organization-wide outreach access can add, verify, retire, or replace a tracking domain. Everyone else sees the same card, read-only, with a line saying so. See Domain Setup for the CNAME steps and for retiring or replacing a domain.

Cold Outreach settings open from the gear on the Marketing hub, and mirror at Settings under your company's outreach page. Everything here applies to your whole organization, not just to you, and every control saves in place as you change it. There is no Save button at the bottom of the page. Seven sections, in order:

As you scale up, how you arrange mailboxes across domains matters as much as the raw count. Best practice is 2 to 3 mailboxes per domain, spread across several sending domains, rather than piling many mailboxes onto one domain. If a single domain picks up a reputation problem, only the mailboxes on that domain are affected and your other domains keep sending. It also keeps the volume on any one domain modest, which is how real senders look. See Domain Setup for authenticating each sending domain.

Many cold-email tools advertise automated “warmup”: networks of mailboxes that email each other and auto-reply to fake an engaged sending history and trick spam filters into trusting a new mailbox. Laureo deliberately does not offer warmup, and here is the honest reasoning.