I'm pretty sure Gmail is where I first noticed this years and years ago. I've been with Fastmail for the past many years, but remember the dialog from Gmail. Ma

I'm pretty sure Gmail is where I first noticed this years and years ago. I've been with Fastmail for the past many years, but remember the dialog from Gmail. Maybe it was an experiment you had to enable and are opted out of? A quick search says that automatic footers (company logos) can be interpreted as attachments...meaning you won't see the warning. Could that be your issue? https://www.lifewire.com/how-to-get-a-forgotten-attachment-reminder-in-gmail-1171993 https://www.lifewire.com/how-to-get-a-forgotten-attachment-r...