Yahoogle Requirements Update

New Requirements for Bulk Senders

• steve
• Oct 3, 2023

• Best Practices , Industry

UPDATE: You need to authenticate with both DKIM and SPF.

Unresolvable RFC.5321 domain at Yahoo

• steve
• May 30, 2023

• Delivery Improvement , Technical

Seen this recently?

451 Message temporarily deferred due to unresolvable RFC.5321 from domain; see https://postmaster.yahooinc.com/error-codes

Wildcards and DKIM and DMARC, oh my!

• steve
• Oct 18, 2023

• Industry , Technical

If you’re an ESP with small customers you may have looked at the recent Google / Yahoo requirements around DMARC-style alignment for authentication and panicked a bit.