code: @Override
  	public Collection<String> sendEmailMessagesWithAtachments(
  		final Collection<EmailMessageWithAttachments> emailAttachments) throws MessagingException
  	{
  		final List<String> messageIds = new ArrayList<>();
  		for (final EmailMessageWithAttachments emailAttachment : emailAttachments)
  		{
  			final String messageId = sendEmailMessageWithAttachments(emailAttachment);
  			messageIds.add(messageId);
  		}
  		return messageIds;
  	}
docs: {@inheritDoc}