What is the optimal email volume per IP address and what factors influence it?

Email marketer from ActiveCampaign shares that testing sending volumes with smaller segments is crucial to gauge deliverability. He recommends A/B testing different volumes to find the optimal balance without triggering spam filters.

Email marketer from Email Marketing Forum emphasizes list quality. He mentions sending to an engaged audience allows for higher volumes without deliverability issues.

Email marketer from Email Geeks mentions that headroom is a big benefit of more IPs and says there is no magic number of emails that a given IP can handle. Recipient provider throughput is the big bottle neck, and sending too many messages from too few IPs can be problematic if your audience is comprised of smaller inbox providers, suggesting performance should be the guide.

Email marketer from Email Geeks explains technical limitations may arise with large attachments. They highlight the risk of relying on a single IP due to potential reputation fluctuations, and states that a clean, engaged list is the key to addressing the IP question.

Email marketer from Email on Acid shares that IP warmup is crucial for new IPs. They recommend starting with a small sending volume and gradually increasing it over time, while closely monitoring deliverability metrics and sender reputation.

Email marketer from Reddit explains the optimal volume depends on IP reputation and engagement. He mentions that low engagement requires lower volume to avoid spam filters.

Email marketer from Litmus explains that key factors impacting email deliverability include authentication, sender reputation, list management, and content quality. Maintaining a clean and engaged list is crucial for higher sending volumes without deliverability issues.

Email marketer from GlockApps explains that IP reputation is a critical factor in determining optimal email volume per IP. They suggest monitoring IP reputation using tools and adjusting sending volume based on the feedback from mailbox providers.

Email marketer from Email Geeks shares experiences with high email volume per IP, including instances of 20 million per IP without issues. He notes a past rule-of-thumb of 1 million per IP based on anecdotal observation and mentions a historical limit of 4 million/day/IP at Hotmail, while emphasising that volume limits were circumvented by spreading volume, which he did not recommend.

Email marketer from HubSpot explains that optimal sending volume is about quality, not quantity. Focusing on sending to engaged contacts and providing valuable content is essential for sustained deliverability.

Email marketer from NeilPatel.com shares that factors influencing deliverability include sender reputation, email authentication (SPF, DKIM, DMARC), list hygiene, engagement metrics (open rates, click-through rates), and spam complaints. He advises monitoring these factors to optimize email volume per IP.

Email marketer from Email Geeks shares that the volume depends on who you are mailing to and suggests considering future growth, so starting to warm another IP can be beneficial.

Expert from Spam Resource explains that factors impacting IP reputation include spam complaints, blocklist status, and overall sending behavior. He suggests monitoring these factors to adjust sending volume accordingly.

Expert from Word to the Wise explains how ISP throttling may begin at different volumes based on IP Reputation. Some may have low thresholds for new IPs.

Expert from Email Geeks explains that there's no hard rule for email volume per IP, and while larger volumes are possible, it reduces headroom for error or throttling. He suggests the ESP may be trying to optimize management, especially during critical issues.

Expert from Email Geeks shares an instance of seeing 20 million emails per day per IP and they were doing fine, although she did move them down.

Expert from Email Geeks explains that some senders send more than 2 million emails per day per IP on SFMC without issues. He suggests continuing if it's working well, but consider more IPs or dedicated MTAs if the building and mailing process is too slow.

Documentation from Google shares that they require senders to authenticate their emails and provide an easy unsubscribe process. They also recommend monitoring spam rates and maintaining consistent sending volumes.

Documentation from Mailchimp explains that sending limits depend on your plan and subscriber count. They suggest gradually increasing sending volume to avoid triggering spam filters and maintaining list hygiene.

Documentation from SparkPost explains that IP warmup involves gradually increasing sending volume to establish a positive reputation with ISPs. They recommend starting with small batches and incrementally increasing volume daily, while monitoring deliverability metrics.

Documentation from SendGrid explains that sending limits are influenced by factors like account reputation, engagement, and compliance with their terms. They recommend following best practices to maintain a good sender score and avoid exceeding sending limits.

Documentation from Microsoft explains that a key part of not being blocked is ensuring that your reputation is good. They recommend working with the feedback loop program.