Currently , JIRA doesn't support viewing SVG image from JIRA . So , admin would like to raised a feature to render SVG image to PNG image from JIRA . Then send email notifications using PNG format.
Auto render SVG image format to PNG when adding comment or attachment.
Download the files from attachment then view it using SVG supported application or via online . For example http://www.rapidtables.com/web/tools/svg-viewer-editor.htm .