Volume spikes around promotions trip ISP rate limits unless warmed and segmented.
What bulk sender requirements are#
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%.
Why it matters#
Non-compliant mail is rejected or filtered at the two largest consumer mailbox providers. Enforcement has tightened each year since.
Implementation plan for ecommerce stores#
- Publish SPF and DKIM, and a DMARC record at minimum p=none with aligned From domain.
- Add List-Unsubscribe headers and honor requests within two days.
- Use a valid forward and reverse DNS (PTR) for sending IPs.
- Monitor spam rate in Postmaster Tools and keep it under 0.1%.
- Send from a subdomain with its own reputation for marketing.
Priorities specific to ecommerce stores#
Volume spikes around promotions trip ISP rate limits unless warmed and segmented. Weight your effort toward the steps above that address this constraint first, and measure with metrics that match how ecommerce stores generate value from email.
Common mistakes#
- Thinking the rules only apply above 5,000; Gmail applies most of them to all senders.
- Using a gmail.com From address for bulk mail, which fails DMARC alignment.
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.