code: public SendEmailRequest withReplyToAddresses(String... replyToAddresses) {
          if (this.replyToAddresses == null) {
              setReplyToAddresses(new java.util.ArrayList<String>(replyToAddresses.length));
          }
          for (String ele : replyToAddresses) {
              this.replyToAddresses.add(ele);
          }
          return this;
      }
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>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReplyToAddresses(java.util.Collection)} or {@link #withReplyToAddresses(java.util.Collection)} if you
  want to override the existing values.
  </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.
  @return Returns a reference to this object so that method calls can be chained together.