The consensus from email marketers, experts, and documentation sources is that emailing users inactive for 4+ years is generally detrimental to email deliverability and sender reputation. There are several reasons for this: inactive users are more likely to mark emails as spam, they may have forgotten subscribing, their email addresses may have become spam traps, and sending to such addresses wastes resources. It is recommended to implement a sunset policy, clean email lists regularly, re-engage inactive subscribers with targeted campaigns and incentives (while respecting data privacy regulations like CASL's implied consent rules), and validate email addresses to avoid hitting spam traps. Maintaining a clean list helps improve deliverability, engagement, and overall ROI, while also mitigating security risks associated with storing outdated data.

Emailing users inactive for 4+ years is generally considered detrimental to email deliverability and sender reputation. Experts and marketers advise against this practice due to risks such as increased spam complaints, hitting spam traps, and damaging sender reputation, potentially leading to deliverability issues. The consensus is that inactive users are less likely to remember subscribing, more likely to mark emails as spam, and may have abandoned their email addresses, which could now be spam traps. Instead of directly emailing these users, it is recommended to implement a sunset policy, re-engage them through targeted campaigns, reconfirm consent, and remove those who don't respond. Regularly cleaning email lists by removing inactive subscribers is also crucial for maintaining a healthy sender reputation, improving engagement rates, increasing conversions, and protecting against potential security risks.

Experts generally agree that emailing users inactive for 4+ years is a detrimental practice. Sending to old addresses risks hitting spam traps and damaging sender reputation. Furthermore, from a user experience perspective, recipients are more likely to mark such emails as spam. Maintaining outdated email lists poses security risks, making the stored data a target for hackers.

Emailing users inactive for 4+ years is detrimental to deliverability, as highlighted by various documentation sources. These sources recommend list cleaning, implementing a sunset policy, and avoiding sending unwanted emails to prevent negative impacts on sender reputation and increased spam complaints. Metrics such as complaint rates are crucial for evaluating sender reputation, and a proactive approach to removing unengaged subscribers is advised.