I use gmail predominantly, and interface with it both from the web interface, but also using Thunderbird as muy web client (you could use Outlook also). I don't recall seeing read receipts as a feature in the web interface (but I could have missed it), but you can certainly request them when using a desktop interface such as Thunderbird or Outlook.

I still have a couple of Yahoo accounts, but rarely use them. Of course, Yahoo now belongs to Verizon, since they bought them out.


John

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