@mtechman Not clear where "smoke detector" comes in? 😀 People assume, I assume, that a sent message gets to the recipient. Things get messy when that assumption is false. Them:'Yes, let's meet tomorrow at 10 am at Midland cafe" Me: [receives nothing] Them tomorrow at 10:20: "Where are you?" Me: "Working on my tax return. Where are you?" So productive of good feelings. Though my problems with messages going missing seems very rare - so rare that no one can tell me why it is happening.