"Activity tracking is built into Mailspring so you get notified as soon as contacts read your messages and can follow up appropriately."
"How contacts engage with your content gives you insight into what's working and what's not. Mailspring can notify you when your links are clicked so you know what's generating interest."
That's something I would actively avoid or circumvent if I discovered it. Do you tell people who you email about this, or hope they don't notice (or care)?
