Just a very, very short post with links to the Yahoo and Google requirements FAQs. Given I can’t ever remember them I’m guessing lots of y’all can’t either.
Yahoo: https://senders.yahooinc.com/best-practices/ and https://senders.yahooinc.com/faqs/
Google: https://support.google.com/a/answer/14229414
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.
Read MoreSince I wrote about it last month the requirements for bulk senders to Yahoo and Google have changed a little.
Read MoreEvery once in a while we’ll see a rejection from Yahoo that says RFCs 554 5.0.0 Message not accepted due to failed RFC compliance. What does that mean and what can we do about it?