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Action Plan: How to meet Google and Yahoo's email sender requirements in 2024
https://academy.klaviyo.com/2024-new-sender-requirements-checklist/1817230
1. whois
Who will be impacted by these new requirements? Everyone – especially bulk senders, or brands that send more than 5,000 emails per day. If these new requirements aren’t met, you'll start experiencing deliverability issues with emails sent to Google and Yahoo email addresses.
https://www.klaviyo.com/blog/gmail-update#new-sender-requirements-faqs3
New sender requirements FAQs