code: @Nonnull
    public static EmailData createEmailData (@Nonnull final EEmailType eEmailType,
                                             @Nullable final IEmailAddress aSender,
                                             @Nullable final IEmailAddress aReceiver,
                                             @Nullable final String sSubject,
                                             @Nullable final String sBody,
                                             @Nullable final IMutableEmailAttachmentList aAttachments)
    {
      final EmailData aEmailData = new EmailData (eEmailType);
      aEmailData.setFrom (aSender);
      aEmailData.setTo (aReceiver);
      aEmailData.setSubject (sSubject);
      aEmailData.setBody (sBody);
      aEmailData.setAttachments (aAttachments);
      return aEmailData;
    }
docs: Utility method for converting different fields to a single
  {@link IMutableEmailData}.
  
  @param eEmailType
  The type of the email.
  @param aSender
  The sender address.
  @param aReceiver
  The receiver address.
  @param sSubject
  The subject line.
  @param sBody
  The mail body text.
  @param aAttachments
  Any attachments to use. May be <code>null</code>.
  @return The created {@link EmailData} and never <code>null</code>.