Should I segregate sending IPs by recipient domain to improve email deliverability?

The overwhelming consensus from marketers, documentation, and experts is that segregating sending IPs by recipient domain is generally unnecessary and often detrimental for improving email deliverability. Modern email deliverability hinges on building and maintaining a strong sender reputation, which is achieved through consistent sending volume, engagement, quality content, proper authentication, and list hygiene. While IP segregation might have had limited applications in the past (e.g., circumventing throttling for specific regions or managing deliverability for extremely large senders), current best practices favor a unified approach. Attempting to segregate IPs by domain can appear suspicious to ISPs, potentially harming sender reputation. Most sources advocate focusing on holistic deliverability strategies rather than relying on outdated tactics like IP segregation.

The general consensus is that segregating sending IPs by recipient domain is usually unnecessary and potentially harmful for most email senders. While it might have been a tactic used by spammers in the past, or a niche solution for circumventing throttling in specific geographic regions, modern email deliverability focuses on sender reputation, engagement, and good sending practices. For very large senders or those experiencing specific deliverability issues with certain domains, IP segregation may offer some benefit. However, for small to medium senders, it's generally considered complex, unnecessary, and a potential risk to sender reputation. Most experts recommend focusing on building a strong sender reputation, practicing good list hygiene, and creating engaging content instead.

Experts generally advise against segregating sending IPs by recipient domain. Reputable ESPs typically don't allow this practice, as they focus on carefully managing sender reputations across shared IPs. Furthermore, mailbox providers consider factors beyond just the IP address when determining deliverability, making a strong sender reputation more important than IP segregation.

Technical documentation generally does not recommend segregating sending IPs by recipient domain for improved email deliverability. While IP pool segmentation is technically possible, managing sender reputation through content quality, engagement, and overall sending practices is considered more effective. Dedicated IPs are suited for high-volume senders managing their own reputation independently, but domain-based segregation is not endorsed. Sender reputation is often assessed domain-wide, making IP segregation unnecessary.