What is Warm-Up?
Warm-up gradually increases sending volume on a new inbox so email providers (like Google) can verify that the account is real, trustworthy, and safe to deliver messages from.
During this process, emails are sent and received between automated, fictional senders, simulating real communication.
This helps the inbox build credibility and sending reputation.
Without warm-up, a brand-new email account appears untrusted.
If it starts sending cold outreach immediately, messages often go straight to spam, or the inbox may be temporarily blocked by Gmail.
Warm-up allows you to avoid that risk.
Why Warm-Up Is Important
• Prevents your emails from going to spam
• Helps Google trust the inbox over time
• Improves deliverability and open rates
• Protects domain health and sending reputation
• Allows scaling - more emails safely, long-term
Email accounts need warm-up before being used in campaigns so ISPs (email providers) can whitelist and accept them.
How Long Warm-Up Takes
Warm-up lasts two weeks.
This is the time required for Gmail and other providers to evaluate the reputation of your inbox.
After warm-up is complete, you can safely send campaigns with higher volume and better deliverability.
What You Need to Do
Nothing.
Prospi fully automates the warm-up process for all inboxes you purchase through the platform.
Your accounts warm up behind the scenes - you do not need to monitor or adjust anything.
Once warm-up is finished, your inboxes are ready for outreach.
Summary
Warm-up makes sure your email accounts don’t get flagged, limited, or placed in spam.
It slowly builds trust so you can send cold emails safely, at scale, and with high deliverability.
Prospi manages this automatically, so you can focus on campaigns - not configuration.