I got a call on Thursday from my mom asking why Apple Mail couldn't SMTP deliver to my LE signed SMTP server. She forgot how to start teamviewer, so a Saturday morning trip to the small town she lives in later... and it she looks like a problem with anchors. On a brand new MacOS system from this year. (Her old iMac had long sinced reached it's maximum OS level and was sadly, replaced) The machine did want to apply updates, which allowed, but I don't know if those updates solved the problem because I had already overridden things. I was surprised anyway, and I'm just posting this as a datapoint. I don't have many details. I don't know what libraries Apple Mail uses.
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