Why not check your Venmo account instead of email ?
Though sadly, on some (most? all?) platforms, even that isn’t a guarantee, as some forms of payment can be rescinded. Or, the notice is communicated as “received” when it’s really more like “requested and processing” (much like banks crediting you for a deposited check, even though it takes weeks for a check to fully clear).
Internet makes a lot of things easier, losing money included.