A read receipt is not proof of receipt but proof that you read it. They are not the same thing. If your office receives registered mail but your secretary threw it away without you reading it, you're still legally served right?
Agreed, but there's no delivered (but not necessarily read) receipt that applies to email so that was closest I could think of that counted. The overall point remains: sending an email, with no further evidence, does not count as proof of delivery (all the way to the inbox).
I don't know how laws work here but I can't imagine having adequate "proof of service" fully insulates you from all possible claims of non-receipt, especially electronically? Like what if the recipient was in a coma or on active duty in the middle of a war zone or something? There have got to be exceptions here to handle some cases of non-receipt despite proof of delivery, so the question of whether spam classification might be one such exception doesn't seem automatically invalid.
> Like what if the recipient was in a coma or on active duty in the middle of a war zone or something? There have got to be exceptions here to handle some cases of non-receipt despite proof of delivery
If the recipient was in a coma, this question couldn't arise at all, because they wouldn't be able to use the service.