Yahoo Sender Hub

Yahoo Sender Hub is Yahoo's sender-facing documentation for mail to Yahoo, AOL, and other consumer brands Yahoo hosts. Its best-practices page lists authentication, DNS, and bulk-sender requirements.

The hub is separate from Google Postmaster Tools and Microsoft SNDS. It describes what Yahoo expects in DNS and message format; it does not publish SPF or DKIM strings for a tenant the way a mailbox provider's admin console might.

Bulk senders

Yahoo's sender requirements page says bulk senders need both SPF and DKIM, a DMARC policy with at least p=none where DMARC must pass, and easy one-click unsubscribe on marketing mail.

The FAQs page says those requirements apply to domains and consumer email brands hosted by Yahoo Mail, and points operators to the Sender Requirements and Recommendations page for the authoritative list.

2024 requirements

Yahoo's sender requirements page lists SPF or DKIM for all senders and stricter SPF, DKIM, and DMARC rules for bulk senders.

The FAQs link bulk senders to Complaint Feedback Loop enrollment when mail is DKIM-signed with an enrolled domain.

Sender Hub Insights in the dashboard shows aggregated delivery statistics after domain verification in Sender Hub.

Full version
Sender Hub documents Yahoo's delivery expectations, complaint feedback loop enrollment, and bulk-sender authentication rules for Yahoo-hosted consumer mail.
What is DMARC
DMARC is a TXT record at _dmarc plus the domain. It tells the receiver what to do when the From address is not aligned with a passing SPF or DKIM result, and where to send the reports.
Google Postmaster Tools
Google Postmaster Tools is a Google service for domain owners who send mail to Gmail. Google's help article says verified owners can see reputation, spam rate, authentication, and delivery errors for their domain.
Microsoft SNDS
Smart Network Data Services (SNDS) is Microsoft's data service for senders who mail Outlook, Hotmail, and other Microsoft-hosted mailboxes. Microsoft's SNDS pages describe IP-level reputation, complaint rates, and trap hits.