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
Seen this recently?
451 Message temporarily deferred due to unresolvable RFC.5321 from domain; see https://postmaster.yahooinc.com/error-codes
Looking back through the month of September there were a couple things talked about on the blog.
Read MoreOne of the things I do for clients is look at who is really handling mail for their subscribers. Steve’s written a nifty tool that does a MX lookup for a list of domains. Then I have a SQL script that takes the raw MX lookup and categorizes not by the domain or even the MX, but by the underlying mail filter.
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