Since I wrote about it last month the requirements for bulk senders to Yahoo and Google have changed a little.
The big change is that bulk senders need to authenticate with both SPF and DKIM, rather than SPF or DKIM. Only one of those has to align with the 822 From: header.
Seen this recently?
451 Message temporarily deferred due to unresolvable RFC.5321 from domain; see https://postmaster.yahooinc.com/error-codes
Yahoo announced today that they are releasing the Yahoo! Mail Anti-Phishing Platform (YMAP) that will help protect their users from phishing. They have a similar project in place for eBay and PayPal mail, but this will extend to a broader range of companies.
Read MoreToday’s Wednesday question comes from Andrew B. and got pushed to Thursday so I could check a few more facts.
Read More