Tracked Senders Email Report This report shows the number of messages sent to each recipients for selected sender emails. This parameter controls which sender emails will be included in the report. E.g. "joe\\@example\\.com" or "(joe|ann|mailer-daemon)\\@example\\.org" or "root\\@example\\.com|john\\.doe\\@example\\.net": regexp's should be Perl style, with suitable escaping. Recipients By Senders Matching $tracked_email_re