Default Samsung Galaxy S5: email Receipts

I just noticed email Receipts via the tracking option have vanished from the s5. I've poked around, but see no way to enable or use this much-needed function for my business communications. Any help would certainly be appreciated. Thanks!

Sent from my SM-G900V using XDA Premium 4 mobile app


Stay Strong,

~ Mike

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Phone: Samsung Galaxy S4

ROM: Stock