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The Resend Go SDK does not provide a dedicated Cancel method for broadcasts. To cancel a scheduled broadcast, you have two options:

​
Option 1: Delete the broadcast

Use the Delete broadcast method to permanently remove the scheduled broadcast: 
response, err := client.Broadcasts.Remove("brd_123456")
if err != nil {
    panic(err)
}

if response.Deleted {
    fmt.Println("Scheduled broadcast cancelled")
}

​
Option 2: Update the broadcast

Use the Update method to modify the broadcast and change its scheduled time or convert it back to a draft: 
params := &resend.UpdateBroadcastRequest{
    BroadcastId: "brd_123456",
    Subject:     "Updated Subject",
    // Modify other fields as needed
}

response, err := client.Broadcasts.Update(params)
Note that updating a broadcast does not automatically unschedule it. You would need to check the Resend API documentation to see if there’s a specific status field or parameter to change the broadcast back to draft status.

​
Cancel scheduled emails

If you need to cancel individual scheduled emails (not broadcasts), use the Emails service: 
response, err := client.Emails.Cancel("email_id")
if err != nil {
    panic(err)
}

fmt.Println("Email cancelled:", response.Id)
See the emails documentation for more details on cancelling scheduled emails.

​
Example: Check before cancelling

package main

import (
    "fmt"
    "github.com/resend/resend-go/v2"
)

func main() {
    client := resend.NewClient("re_123456789")

    // Get the broadcast to check its status
    broadcast, err := client.Broadcasts.Get("brd_123456")
    if err != nil {
        panic(err)
    }

    // Only delete if it's scheduled
    if broadcast.Status == "scheduled" {
        response, err := client.Broadcasts.Remove("brd_123456")
        if err != nil {
            panic(err)
        }

        if response.Deleted {
            fmt.Println("Scheduled broadcast cancelled successfully")
        }
    } else {
        fmt.Printf("Broadcast is not scheduled (status: %s)\n", broadcast.Status)
    }
}

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