Email warm-up is the foundation of successful email outreach. Before you launch your first email campaign in Enginy, warming up your email addresses builds the sender reputation needed to consistently land in your prospects' primary inbox, avoid spam folders, and protect your domain from being blacklisted.

Every email address and domain has a sender reputation score that email providers (Gmail, Outlook, Yahoo, and others) use to decide whether your messages reach the inbox, land in the Promotions tab, or get flagged as spam. When you start sending from a new email address or domain, that reputation score is essentially zero. Email providers have no history to judge your legitimacy, and sudden high-volume sending from an unknown source is one of the strongest spam signals.

Even a well-crafted, personalized outreach email can end up in the spam folder if the sender has no established reputation. This affects open rates, reply rates, and ultimately the revenue you generate from email outreach.

Email warm-up gradually builds your sender reputation over a period of weeks by simulating authentic email activity. During the warm-up process:

The result is that by the time you launch your first campaign, email providers already recognize your address as a trustworthy sender. Your emails bypass spam filters and reach the primary inbox where your prospects will actually see them.

Key benefits of warm-up:

Skipping warm-up is the single most common reason outbound email campaigns underperform. Here is what typically happens when you send campaigns from an address without warm-up:

Enginy's warm-up feature uses an industry-leading external provider that specializes in email deliverability. When you activate warm-up for an email address, the system:

You do not need to configure or manage any of this manually. Once you activate warm-up in Enginy, the process runs automatically.

Warm-up operates on a seat-based model. Each warm-up seat allows you to warm up one email address at a time. If you need to warm up multiple email addresses simultaneously (for example, when onboarding a new sales team or adding new domains), you need one seat per address running in parallel.

While warm-up is running, follow these rules to ensure the process completes successfully and your sender reputation improves as expected:

Once warm-up is complete, your email address has an established sender reputation and is ready for outbound campaigns. However, transitioning to full campaign volume requires a careful approach.

Start with conservative sending limits and increase gradually as your reputation continues to strengthen with real campaign engagement:

You can configure these limits in Identities > Configuration > Email > Email Rate tab. Enginy's maximum allowed configuration is 80 emails per inbox per day and 10 emails per inbox per hour.

Connecting multiple warmed-up email addresses to Enginy is the recommended strategy for scaling outreach safely:

You can configure Enginy to rotate between connected email accounts when sending campaign emails using the Shuffle option in your campaign's Email Inbox setting, or assign different campaigns to different addresses.

Warm-up is the most critical step, but it works best as part of a complete deliverability strategy. Use this checklist to maximize your inbox placement rates.

Before launching any email campaign, ensure your sending domain has proper DNS authentication configured:

You have just set up a new domain (e.g., outreach.yourcompany.com) and created fresh email addresses for your sales team. Without warm-up, the very first campaign you send from these addresses will almost certainly land in spam. Activate warm-up for each address, wait two weeks, and then launch campaigns with confidence that your emails will reach the inbox.

Your existing email address has been sending high volumes without proper limits, and you have noticed declining open rates and increasing bounces. In this scenario, pause all campaigns, activate warm-up on the affected address (or set up a new address on the same domain), and let the process rebuild your sender reputation. After warm-up, resume campaigns with conservative sending limits and monitor performance closely.

Your team is growing from 2 SDRs to 10, and each new rep needs their own email address ready for outreach. Purchase enough warm-up seats to warm all 10 addresses simultaneously. In two weeks, every rep can start sending campaigns at the same time rather than waiting months for sequential warm-up.

It is not mandatory to stop campaigns, but it is highly recommended. Sending campaign emails from an address that is being warmed up can interfere with the controlled, gradual reputation-building process. For the best results, pause all campaigns using that identity until warm-up is complete.

You will receive automated emails from the warm-up network during the warm-up period. These are part of the process. Simply open and archive them. Do not mark them as spam — doing so would directly counteract the reputation improvements that warm-up is building for you.

Each warm-up seat allows you to warm up one email address at a time. To warm up multiple addresses simultaneously, you need one seat per address. Contact your Account Manager or chat support to add more seats to your plan.

If an email address has been inactive for an extended period (several weeks or more), its sender reputation may have degraded. In this case, running warm-up again before resuming campaigns is a good practice to restore your reputation baseline.

Yes. Enginy's warm-up feature works with all email accounts connected to the platform, including Google (Gmail/Workspace), Microsoft 365 (Outlook), and IMAP-connected inboxes.

If you are adding a new email address on an established domain, warm-up is still recommended. While the domain itself may have reputation, individual email addresses build their own sending history. Warm-up ensures the new address starts strong. If you are already sending from an established address with healthy metrics, warm-up is not required.

After completing warm-up and launching your first campaigns, monitor your email metrics in the campaign Overview tab. Healthy indicators include inbox placement rates above 90%, low bounce rates, and open rates consistent with industry benchmarks. If you notice emails landing in spam despite warm-up, review your DNS authentication and sending limits.