A few days ago my Mom and sis started getting email bounces for me. They are both on iCloud. I got a look at one of the bounce messages today - Apple is interpreting my graylist 421 temp fail status code as a permanent failure.

The problem showed up now because Apple started using a new netblock. I had the old block whitelisted so graylisting didn't get invoked. Whitelisting the new block fixes it for now, until they change addresses again.

But really, Apple should OBEY THE FUCKING RFC.

email bounce message showing Apple's iCloud interpreting a temporary failure status code as a permanent failure
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