Tagged “yahoo”

All Guides Product & news Forwarding & lists Fundamentals DMARC SPF DKIM BIMI Transport security Deliverability Threats & fraud Compliance & industries Provider setup Standards & RFCs How-to guides Troubleshooting

4 articles

18 June 2026 · 11 min read

The Google and Yahoo sender rules, one year on

A year after Google and Yahoo made authentication mandatory for bulk senders, here is what changed, how mail failed, and where enforcement is heading.

24 May 2026 · 11 min read

One-click unsubscribe: the List-Unsubscribe requirement

Google, Yahoo and Microsoft now require working one-click unsubscribe on bulk mail. Here is what the List-Unsubscribe and List-Unsubscribe-Post headers are, how RFC 8058 one-click actually works on the wire, how to implement it correctly, and why it sits alongside SPF, DKIM and DMARC on the same deliverability checklist.

20 May 2026 · 11 min read

Why Gmail, Yahoo and Microsoft now require DMARC

Gmail, Yahoo and Microsoft now require SPF, DKIM and DMARC from bulk senders. Here is what each demands, what "require" really means, and how to comply.

19 May 2026 · 12 min read

The 2024 and 2025 bulk-sender requirements in full

Google, Yahoo and Microsoft turned email authentication into a hard delivery gate. Here are the exact requirements, the numeric thresholds, who counts as a bulk sender, and a line-by-line compliance checklist.