> A naïve question. A certificate that contains SAN attribute(s) – is there a 
> limit on how many, say, RFC822 SAN attributes can a valid certificate have? 

No.

> It’s been my understanding that a cert can contain as many SAN attributes as 
> needed, but it appears that Apple believes it has to be only one (because 
> certificates with more than one are not processed properly).

I can guess at, and understand, their reasoning -- it allows mail spoofing and 
stealing.  And the use of such certs is not common. 
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