Non-compliant mail is rejected or filtered at the two largest consumer mailbox providers. Enforcement has tightened each year since.
Mistake 1: Thinking the rules only apply above 5,000; Gmail applies most of them to all senders#
Why it hurts: this undermines bulk sender requirements at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Publish SPF and DKIM, and a DMARC record at minimum p=none with aligned From domain.
Mistake 2: Using a gmail.com From address for bulk mail, which fails DMARC alignment#
Why it hurts: this undermines bulk sender requirements at the point where mailbox providers make their decision, and it is rarely surfaced by your own tooling until placement drops.
Fix: Add List-Unsubscribe headers and honor requests within two days.
Frequently asked questions#
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.