Domain warming

Domain warming gradually increases the number of emails a new Qualified mailbox can send each day, ramping the volume up over several weeks. It helps establish and protect the sending domain's reputation so email from a new or newly reconnected mailbox is more likely to reach recipients' inboxes as Piper the AI SDR Agent begins sending on your behalf.

Why domain warming matters

Mailbox providers pay attention to how a domain sends email. A brand-new domain, or one that suddenly starts sending at high volume, can look suspicious and end up filtered to spam or blocked.

Warming reduces that risk by starting with a low daily send limit and raising it on a set schedule. This gives mailbox providers time to build trust in the domain before it sends at full volume.

What to expect while a domain is warming

Warming runs over seven weekly stages. Each stage sets a daily send limit that holds steady for that week, and the limit rises with each new week. The default schedule is:

Each limit is a daily cap. For example, during week 3 the domain can send up to 500 emails per day. Once the domain reaches week 7, warming is complete and it sends at full volume.

If a domain needs a different ramp, contact your Qualified Success Architect (QSA).

While a domain is warming, keep the following in mind:

• The daily limit applies to email sent through a Qualified mailbox by your AI SDR agent.
• When a domain reaches its daily limit, the remaining sends pause for the rest of the day and resume the next day.
• The daily count resets every 24 hours.

When domain warming applies

Domain warming takes effect when both of these are true:

• The sending domain has been verified.
• Warming was turned on when the mailbox was set up, using the toggle below the sender address field in Settings → App Settings → Mailboxes. To learn more, see Setting up Qualified Mailbox.

Warming applies only to email sent through a Qualified mailbox. Email sent by other means is not affected.