The "unsend" function of a message via Gmail that existed in the web versions is now also available in the version for Android.
This function allows you to recall an email message that you have just sent. The recall time you have at your disposal is a few seconds, but long enough to press it button "Undo" and the accidental email not to be delivered to its destination.
While these errors usually do not happen when you work on a large keyboard like a desktop for example, however, on the small surface of a mobile phone it is very easy to press the wrong button and send an email half-finished.
As of version 8.7 of Gmail for Android, you have the right αναίρεσης και στο κινητό σας τηλέφωνο. Μετά την αποστολή ενός μηνύματος ηλεκτρονικού ταχυδρομείου, θα εμφανιστεί μια μαύρη γραμμή στο κάτω μέρος της screen with the “UNDO” option, which unlike the original desktop mode, is enabled by default.
Just press it within 5 seconds and your wrong message will never be delivered to the recipient.