Warming up an inbox typically takes several weeks to a few months, depending on various factors such as email volume, sender reputation, engagement rates, and recipient behavior. A typical warm-up process involves gradually increasing the volume of emails sent to ensure that ISPs (Internet Service Providers) recognize the sender as legitimate and trustworthy.

Warming up an inbox is a crucial process for email marketers, especially when starting with a new email domain or IP address. Here's a more in-depth look at the factors involved:

1. Gradual Increase in Volume: Initially, you start by sending a small number of emails per day and gradually increase the volume over time. This allows ISPs to monitor your sending behavior and assess whether your emails are legitimate or spam.
   
   
2. Establishing Sender Reputation: ISPs use various metrics to evaluate sender reputation, including email engagement (open rates, click-through rates), spam complaints, and bounce rates. By gradually increasing the volume and maintaining positive engagement metrics, you can build a positive sender reputation.
   
   
3. Quality of Email Content: The content of your emails also plays a crucial role in inbox warming. Emails with relevant, valuable content are more likely to be engaged with by recipients, signaling to ISPs that your emails are wanted and trustworthy.
   
   
4. Consistency and Frequency: Consistently sending emails at a regular frequency helps establish a pattern of behavior that ISPs can recognize as legitimate. Erratic sending patterns or sudden spikes in email volume can trigger spam filters.
   
   
5. Monitoring and Adjusting: Throughout the warm-up process, it's essential to monitor key metrics closely and adjust your sending strategy accordingly. If you notice a decline in engagement or an increase in spam complaints, it may indicate that you need to slow down or reassess your email content and targeting.
   
   
6. Domain and IP Reputation: Building a positive reputation for both your sending domain and IP address is essential. This involves not only sending relevant and engaging emails but also avoiding practices that can harm your reputation, such as sending to purchased email lists or using deceptive subject lines.
   
   
7. Patience and Persistence: Warming up an inbox is not a one-time event but an ongoing process. It requires patience and persistence to gradually earn the trust of ISPs and establish a strong sender reputation that will benefit your email deliverability in the long run.
   
   

Overall, warming up an inbox is about building trust with both recipients and ISPs, demonstrating that your emails are valuable, relevant, and wanted. By following best practices and maintaining a focus on quality and engagement, you can increase the likelihood that your emails will reach the intended recipients' inboxes.