The number of emails you can send per dedicated IP address before needing another one is not a fixed limit. It's heavily dependent on building and maintaining a strong sender reputation. Experts and marketers emphasize the importance of gradually warming up the IP by starting with a small, highly engaged audience and consistently increasing volume over time. Key to success is closely monitoring engagement metrics (open rates, bounces, complaints) and proactively managing your email lists by pruning unengaged contacts and correcting errors. While some suggest considering a second IP around 400k-500k emails/day or 1-2 million emails/day, it's more crucial to prioritize a healthy sending reputation and engagement over sheer volume. Proper email authentication is also essential.

The number of emails you can send per dedicated IP before needing another isn't a fixed number, but rather depends on several factors. It's crucial to build and maintain a good sender reputation by sending consistent volume of engaging content to opted-in subscribers. Most experts agree on gradually warming up the IP by starting with small batches to highly engaged users and slowly increasing the volume. Monitor engagement metrics like open rates, bounces, and complaints, and adjust your sending practices accordingly. Considerations include the type of content, the target audience, and adherence to email best practices. Some rules of thumb suggest considering a second IP around 400k-500k emails per day, or at 2 million emails per day. However, it's more important to focus on the quality of your sending practices and your reputation.

Experts suggest considering an additional dedicated IP when approaching sending volumes of 1-2 million emails per day per IP. However, warming up the IP by focusing on engagement with active list management and careful monitoring are essential for optimal deliverability before reaching these volumes.

All documentation emphasizes the importance of gradually increasing sending volume to new IP addresses. Starting with a small, engaged audience and consistently increasing the amount sent over time is essential for building a positive sender reputation. Continuous monitoring of metrics like bounces, complaints, and overall engagement is critical to ensuring deliverability and preventing negative impacts on sender reputation. Additionally, managing your reputation and ensuring email authentication are critical for maintaining a good reputation with mailbox providers.