Since February 2024, Gmail and Yahoo require senders of 5,000+ daily messages to authenticate with SPF, DKIM, and DMARC, support one-click unsubscribe, and keep spam complaint rates under 0.3%.
What happens if I do not comply with Gmail bulk sender rules?
Temporary failures (4xx) escalating to rejections, and reduced inbox placement. Gmail announced enforcement in stages through 2024 and beyond.
Why does bulk sender requirements matter for deliverability?
Non-compliant mail is rejected or filtered at the two largest consumer mailbox providers. Enforcement has tightened each year since.
What is the first step to get started with bulk sender requirements?
Publish SPF and DKIM, and a DMARC record at minimum p=none with aligned From domain.
What is the most common bulk sender requirements mistake?
Thinking the rules only apply above 5,000; Gmail applies most of them to all senders.