Looks like we need to add another falsehood to the list: * all (or even most) engineers and other technical persons know and understand the details of mail exc

Looks like we need to add another falsehood to the list: * all (or even most) engineers and other technical persons know and understand the details of mail exchange I do, but I wouldn't expect all to have much understanding and I wouldn't expect most to know a lot of the finer detail. Heck, I think I've just learned that local-part has a 64 octet limit (or if I already knew it I'd forgotten).