Avoid spam folders and generate 3X more email leads

Email warmup is a process of preparing a new (or long-inactive) email account for future email outreach, campaigns, etc. It is especially useful for cold email inboxes that usually suffer from lower deliverability rates due to the character of the emails they send.

Connect your email account to the Warmup Inbox network. Our system automatically sends and receives emails on your behalf, gradually increasing the volume and engagement (opens, replies, "mark as important") to prove to providers that you are a trustworthy sender.

Yes, but proceed with caution. We recommend keeping your campaign volume low (e.g., under 20-50 emails per day) during the first few weeks. Let the warmup tool handle the majority of the traffic to establish a solid reputation baseline before you scale up.

We support all major email service providers, including Google Workspace (Gmail), Microsoft 365 (Outlook/Exchange), Yahoo, and Zoho. Additionally, we support any custom email provider that allows connection via SMTP/IMAP.

Email warmup is the process of gradually building trust with email providers. By slowly increasing your daily sending volume and generating automated positive engagement (opens and replies), you prove you aren't a spammer, ensuring your real campaigns land in the primary inbox instead of the spam folder.

A pre-warmed email address has a consistent sending history and steady engagement. It shows natural activity patterns, real replies, and stable deliverability metrics. Inbox providers see it as a trusted sender rather than a sudden spike of cold outreach. That trust increases the chances of your emails landing in the primary inbox instead of spam.

If you're only sending a few emails to people you know, no. But if you are sending hundreds of cold emails for lead generation, yes. Warmup prevents providers (like Google) from flagging your sudden volume spikes as spam by simulating natural, human-like sending behavior first.

You'll see the first improvements within 3 to 7 days, but a full ramp takes 14 to 21 days minimum. Spam filters look for a natural, gradual increase in activity, so rushing the process almost guarantees your domain gets burned. Once you're warmed up, keep warmup running alongside your campaigns to hold your reputation.

Yes, by building a positive sender reputation. Our network automatically opens, replies to, and rescues your emails from spam folders, training algorithms to trust your domain. However, to stay in the inbox, you still need to send good, personalized email copy.