Interac e-Transfers are typically sent in real time and can’t be cancelled once they’ve been accepted.
You may be able to cancel the transfer if:
It was sent to the wrong email address and the transfer remains unclaimed, OR
The recipient hasn’t set up auto-deposit and hasn’t accepted the funds.
To try cancelling the transfer, go to Venn “Transactions”, select the Interac e-Transfer, and look for the cancel option. This option may only appear about one hour after the transfer was sent, and only if the funds haven’t been claimed.
Important: Cancellation is done on a best-efforts basis and depends on the recipient’s bank cooperating to return the funds. If the status still shows “In Progress” 24 hours after you initiate the cancellation, it likely means the cancellation failed and the funds were received by the recipient.