<SMTP gmail can't send in real device in kotlin> E...

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SMTP gmail can't send in real device in kotlin
Everyone.
I am trying to send gmail using SMTP in kotlin.
It works on android emulator as well but does not work in real devices such as Sumsung tablet or phone.
I tried several ways for sending gmail but everything works on emulator but does not work on real devices.
val stringSenderEmail = "[e-mail]"
val receiverEmail = InternetAddress(recipients)
val stringPasswordSenderEmail = "ikdb jeif wlzr upcd"

val stringHost = "smtp.gmail.com"

val...