Gmail undo send option: This is really a great feature for cancelling the send messages, since last October, it is appeared as a hidden experimental feature in mail labs. Now, it appeared in the general settings tab of Gmail account. You can block a message from being sending up to 30 seconds. For adding this peculiar option in your account, Select the undo send option that enabled in the Gmail, now ‘tick’ the ‘Undo Send’ and set the ‘Send Cancellation Period’ after that select the ‘Save Changes.’ That’s all the procedure. to know more you can visit emailnotwrking gmail customer service

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