17. Tracking key sample Aggregate statistics for the last 3 months from all small businesses using Constant Contact. Compare with other sites Totals for the last three months. Last 3 months Totals since using Constant Contact. Overall Number of forwarded emails divided by the number opened. Forward Email to a Friend percent Number of times the campaign was forwarded using the Forward Email to a Friend link. Forwards Number of click-throughs divided by the number opened. Click-through percent Subscribers who clicked from an email to your website. Clicks Number of opened emails divided by the number sent. Opened percent Trackable emails your subscribers received and viewed. Opens Number of opt-outs divided by the number sent. Opt-out percent Subscribers who permanently removed themselves from your subscriber list. Opt-outs Number of complaints received from an email campaign. Spam Reports Number of bounced emails divided by the number sent. Bounced percent Emails sent, but not received by your subscribers. Bounces The total emails sent by an email campaign including bounced emails. Sent