code: public SendEmailRequest withEmailTags(MessageTag... emailTags) {
          if (this.emailTags == null) {
              setEmailTags(new java.util.ArrayList<MessageTag>(emailTags.length));
          }
          for (MessageTag ele : emailTags) {
              this.emailTags.add(ele);
          }
          return this;
      }
docs: <p>
  A list of tags, in the form of name/value pairs, to apply to an email that you send using the
  <code>SendEmail</code> operation. Tags correspond to characteristics of the email that you define, so that you
  can publish email sending events.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setEmailTags(java.util.Collection)} or {@link #withEmailTags(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param emailTags
  A list of tags, in the form of name/value pairs, to apply to an email that you send using the
  <code>SendEmail</code> operation. Tags correspond to characteristics of the email that you define, so that
  you can publish email sending events.
  @return Returns a reference to this object so that method calls can be chained together.