alt Hacker NewsOn the other hand, by erroneously treating a SHOULD as a MUST, I would say that Google is the one who's not RFC-compliant
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ragall • yesterday at 5:00 PM
The RFC says a SHOULD is to be treated like a MUST, but well-justified exceptions are allowed.
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Google is rejecting it to ensure incoming messages aren't spam. SHOULD means "you should do this unless you have a really, really good reason not to." Do they have a good reason not to? It doesn't seem so, meaning Viva is in the wrong here.