Yahoo deliverability - this time it’s personal

Posted by joy

I’ve written about Yahoo deliverability earlier, but now it’s personal.

The mailserver I use is being deferred via a 421 code by Yahoo, and judging by the fact I’m on shared hosting and the mailserver IP has been spotted on some minor blocklists, I’ve got a virtual neighbor with a problem.


In this case, Yahoo is definitely not deferring my mail because of content (I’ve tested this) but they’re taking action because of the originating IP address.

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