Angular how to get the multiple checkbox values?

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Since you have several values you want to use, you need to use an FormArray, since FormControl can only capture one value.

Start with declaring an empty formArray:

this.myForm = this.fb.group({
  useremail: this.fb.array([])
});

Iterate the your emails, and watch for the change event and pass the respective email and event to a method onChange where you check if it’s checked, then add the respective email to the formarray, if it’s unchecked, remove the chosen email from the form array:

<div *ngFor="let data of emails">
  <input type="checkbox" (change)="onChange(data.email, $event.target.checked)"> {{data.email}}<br>
</div>

And onChange:

onChange(email:string, isChecked: boolean) {
  const emailFormArray = <FormArray>this.myForm.controls.useremail;

  if(isChecked) {
    emailFormArray.push(new FormControl(email));
  } else {
    let index = emailFormArray.controls.findIndex(x => x.value == email)
    emailFormArray.removeAt(index);
  }
}

Demo

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