Both Gmail and Yahoo have rolled out significant changes to their spam filtering and sender requirements, effective February 2024. These updates are designed to enhance user security and improve the inbox experience by mandating stricter standards for email senders. Key requirements now include comprehensive email authentication using SPF, DKIM, and DMARC, maintaining an extremely low spam complaint rate, specifically below 0.3%, and providing an easy, one-click unsubscribe option for marketing messages. Failure to comply with these new rules will directly and severely impact email deliverability, potentially leading to messages being rejected, sent to spam folders, or blocked entirely. Early observations also suggest Gmail is implementing even more nuanced filtering, evidenced by new warning banners indicating potentially suspicious messages, even for senders who historically had good reputations.
10 marketer opinions
Email deliverability has certainly been impacted by recent, significant updates from major providers. Gmail and Yahoo implemented stricter spam filtering requirements starting in February 2024, representing a substantial shift for bulk senders. These changes specifically mandate robust email authentication protocols such as SPF, DKIM, and DMARC. Senders must also maintain exceptionally low spam complaint rates, below 0.3%, and provide a straightforward one-click unsubscribe option. Non-compliance with these new rules has direct consequences, increasing the likelihood of emails being blocked, routed to spam folders, or rejected outright. Beyond these explicit requirements, some senders are observing new warning banners in Gmail, even for previously compliant messages, which suggests more nuanced and proactive filtering at play.
Marketer view
Marketer from Email Geeks explains that while compliant and having low spam rates, some clients are experiencing noticeable drops in Gmail open rates, with seedbox tests showing emails landing in the Promotions tab with a new warning banner saying, "Images in this message are hidden. This message might be suspicious or spam." This suggests potential changes in Gmail filters beyond just tab placement.
5 Sep 2024 - Email Geeks
Marketer view
Email marketer from Mailchimp Blog explains that both Gmail and Yahoo introduced new requirements in February 2024, focusing on email authentication (SPF, DKIM, DMARC), spam rate thresholds, and one-click unsubscribe. These changes aim to enhance security and user experience, directly impacting deliverability for senders who do not adapt to these stricter standards by increasing the likelihood of emails landing in spam or being rejected.
28 Jun 2025 - Mailchimp Blog
4 expert opinions
Gmail and Yahoo have indeed rolled out significant updates to their spam filters and sender requirements, which became effective in February 2024. These changes are primarily designed to enhance user experience by drastically reducing spam and improving the overall security of email communications. Key mandates for bulk senders now include robust email authentication protocols such as SPF, DKIM, and DMARC, alongside the provision of a straightforward one-click unsubscribe option. Senders are also expected to ensure their emails are genuinely wanted by recipients to avoid spam folder placement. Experts suggest that Google's filtering systems are now capable of filtering messages that were previously left untouched, a change potentially signaled by new warning banners appearing in inboxes. These banners are considered critical 'warning shots,' indicating an imminent risk of deliverability issues and even blocks if sending practices are not promptly corrected.
Expert view
Expert from Email Geeks explains that Google is likely making filtering changes, enabling them to filter mail they previously couldn't due to potential collateral damage, which aligns with their new requirements.
1 Mar 2024 - Email Geeks
Expert view
Expert from Email Geeks explains that a spam warning banner indicates a strong possibility of automated opens ceasing and serves as a critical "warning shot" to immediately fix sending practices, as real delivery problems and blocks will follow soon if not addressed.
21 May 2025 - Email Geeks
3 technical articles
The realm of email deliverability has been significantly reshaped by recent updates from major providers. As of February 2024, Gmail and Yahoo have implemented stricter spam filtering standards, primarily aimed at improving user protection and inbox quality. These new mandates require bulk senders to rigorously authenticate their emails using SPF, DKIM, and DMARC protocols. Furthermore, senders must maintain a very low spam complaint rate, specifically below 0.3%, and offer a clear one-click unsubscribe option. Non-compliance with these rules carries severe consequences, leading to emails being rejected, routed directly to spam folders, or completely blocked. While Microsoft has not introduced similar direct filter changes, it actively supports these industry-wide shifts towards stronger authentication, indicating a broader move towards enhanced email security across all platforms.
Technical article
Documentation from Google Workspace Admin Help explains that as of February 2024, senders to Gmail must authenticate their email with SPF, DKIM, and DMARC, maintain a low spam rate below 0.3%, and provide an easy one-click unsubscribe option. These changes are designed to protect Gmail users from unwanted emails and significantly impact deliverability for senders not meeting these standards, potentially leading to rejection or spam placement.
8 Jan 2023 - Google Workspace Admin Help
Technical article
Documentation from Yahoo Mail Help states that starting February 2024, senders to Yahoo Mail must implement strong email authentication (SPF, DKIM, DMARC), send unsolicited mail to less than 0.3% of recipients, and provide one-click unsubscribe, similar to Gmail. Failure to comply will result in emails being rejected or quarantined, severely impacting deliverability and inbox placement.
10 Aug 2023 - Yahoo Mail Help
Do Gmail algorithms change before the holidays, affecting email deliverability?
How do the Yahoo and Google updates impact B2B email senders?
What changes are happening with Gmail deliverability, especially regarding spam filtering and industry targeting?
What DMARC/DKIM/SPF updates are needed for new Gmail/Yahoo requirements?
Why has Gmail deliverability dropped recently and emails are going to spam?
Why is there a sudden increase in Gmail spam filtering?