code: public void setReplyToAddresses(java.util.Collection<String> replyToAddresses) {
          if (replyToAddresses == null) {
              this.replyToAddresses = null;
              return;
          }
  
          this.replyToAddresses = new java.util.ArrayList<String>(replyToAddresses);
      }
docs: <p>
  The "Reply-to" email addresses for the message. When the recipient replies to the message, each Reply-to address
  receives the reply.
  </p>
  
  @param replyToAddresses
  The "Reply-to" email addresses for the message. When the recipient replies to the message, each Reply-to
  address receives the reply.