public Attachment getAttachment(String contentId) { Assert.hasLength(contentId, "contentId must not be empty"); MimeHeaders mimeHeaders = new MimeHeaders(); mimeHeaders.setHeader(TransportConstants.HEADER_CONTENT_ID, contentId); Iterator<AttachmentPart> iterator = getImplementation().getAttachment(getSaajMessage(), mimeHeaders); if (!iterator.hasNext()) { return null; } AttachmentPart saajAttachment = iterator.next(); return new SaajAttachment(saajAttachment); }