async renderHTML(report, recipient) {
                // Filter out mentions with duplicate source url from the report
                const uniqueMentions = report.mentions.filter((mention, index, self) => {
                    return self.findIndex(m => m.sourceUrl.href === mention.sourceUrl.href) === index;
                });

                return staffService.api.emails.renderHTML('mention-report', {
                    mentions: uniqueMentions,
                    recipient: recipient,
                    hasMoreMentions: report.mentions.length > 5
                });
            }
@param {MentionReport} report
@param {MentionReportRecipient} recipient
@returns {Promise<string>}