code: public static void startMailClient(@NonNull final Context context,
                                         @NonNull final String emailAddress,
                                         @Nullable final String subject,
                                         @Nullable final String text) {
          Condition.INSTANCE.ensureNotNull(emailAddress, "The e-mail address may not be null");
          Condition.INSTANCE.ensureNotEmpty(emailAddress, "The e-mail address may not be empty");
          startMailClient(context, new String[]{emailAddress}, subject, text);
      }
docs: Starts the mail client in order to send an e-mail to a specific e-mail address. If an error
  occurs while starting the mail client, an {@link ActivityNotFoundException} will be thrown.
  
  @param context
  The context, the mail client should be started from, as an instance of the class
  {@link Context}. The context may not be null
  @param emailAddress
  The e-mail address, the e-mail should be sent to, as a {@link String}. The e-mail
  address may neither be null, nor empty
  @param subject
  The subject of the e-mail, which should be sent, as a {@link String} or null, if the
  e-mail should not have a subject
  @param text
  The text of the e-mail, which should be sent, as a {@link String}  or null, if the
  e-mail should not have a text