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Summary

There is no universally fixed daily sending limit for an IP address. The maximum volume an IP can send reliably depends on a multitude of factors, including the IP's reputation, its warming status, the quality of your recipient list, and the specific policies of the receiving mailbox providers (ISPs). While some anecdotal evidence suggests a single IP can handle millions of emails per day, this is only achievable under optimal conditions with well-established sending practices.

What email marketers say

Email marketers often discuss IP sending limits in practical terms, focusing on real-world experiences and the dynamic nature of deliverability. They emphasize that while theoretical maximums might be high, actual sustainable volumes are heavily influenced by the sender's specific circumstances, particularly their domain and IP reputation. The consensus points to a flexible approach rather than a rigid daily cap.

Marketer view

Email marketer from Email Geeks indicates there are many variables to consider for IP sending limits. They have direct experience with clients successfully sending millions of emails within an hour from a single IP address, highlighting the vast differences in performance based on setup and reputation.

29 Jul 2020 - Email Geeks

Marketer view

An email marketer from Quora states that to send 1,000,000 emails daily, a sender might need around two IP addresses, provided those IPs maintain a strong reputation. They imply that the number of IPs scales with the volume, but reputation is a critical underlying factor.

15 Apr 2023 - Quora

What the experts say

Email deliverability experts highlight that the concept of a fixed daily IP sending limit is largely a misconception. Instead, they emphasize that optimal sending volume is a dynamic measure tied to an IP's reputation, the sending patterns, and the intelligence of the receiving mail server. True capacity is built over time through consistent, healthy sending practices rather than adhering to a generic numerical cap.

Expert view

Email expert from SpamResource suggests that the ideal daily sending limit for an IP address is not a fixed number, but rather a flexible range determined by the sender's reputation, complaint rates, and engagement metrics. He explains that consistently positive sender behavior allows for higher volumes, while negative signals rapidly reduce acceptable limits.

05 Mar 2023 - SpamResource

Expert view

Email expert from Email Geeks, tvjames, states that true IP capacity is measured by the recipient's response, not an arbitrary number. He advises focusing on maintaining low complaint rates and high engagement to effectively scale sending volumes without hitting artificial limits imposed by ISPs.

29 Jul 2020 - Email Geeks

What the documentation says

Official documentation from various Email Service Providers (ESPs) and large mailbox providers (MBPs) rarely specifies a hard, universal daily sending limit for an IP address. Instead, they provide guidelines related to IP warming, reputation management, and acceptable sending practices. These resources emphasize that effective sending volume is a function of trust and consistent positive engagement rather than a static numerical threshold.

Technical article

Documentation from Twilio SendGrid outlines that IP warm-up is crucial for new dedicated IPs. It explains that new IPs lack a sending history, and ISPs will initially treat traffic from them with suspicion. A gradual increase in volume is necessary to build a positive sending reputation and avoid rate limiting or blocklisting, which directly impacts the daily send limit.

20 May 2024 - Twilio

Technical article

Amazon Web Services (AWS) documentation indicates that while there isn't a direct way to limit email sending from a specific IP within SES, managing sending quotas and ensuring high-quality content are critical for deliverability. This implies that the 'limit' is self-regulated through reputation and compliance with best practices, rather than a hard cap.

15 Mar 2023 - Amazon Web Services, Inc.

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