There is no value in returning 'true' here because it provides no information.

If you are returning a boolean to indicate success then this suggests that callers should check this value and react accordingly i.e.

```ruby
if dotmailer_account.suppress('joe@acme.test')
  do_the_something_when_it_is_successful
else
  do_something_which_you_would_like_to_use_to_handle_failure
end
```

However since the method never returns false, failure handling code like this would never be called.

I assume that for this method any failures will be raised as exceptions and so any failure handling code will need to use `rescue`.