What Is Reply Rate?

Replies divided by delivered messages. Using messages sent as the denominator folds the bounce rate into the result, so a campaign to a poor list looks worse in a way that says nothing about the copy, and a fix to verification then looks like a copywriting win.

The numerator needs a rule too. Counting every inbound message double-counts a thread where someone replies twice, so the usual unit is one reply per contact, deduplicated, which also makes the figure comparable between campaigns of different lengths.

Automatic messages, mostly. Out-of-office responses, delivery notifications and mailbox rule replies all arrive as inbound mail, and a tool that classifies inbound as a reply counts them. So do internal forwards that come back from a colleague.

The other inflation source is a message people do not understand. A vague email produces replies asking what it is about, which reads as engagement in the report and produces no conversation, which is why positive reply rate is the figure worth tracking alongside it.

Not a usable one. Published figures come from different list sources, industries, seniority levels, offers and definitions of a reply, and almost never state which, so a number lifted from a vendor page cannot tell you whether your campaign is doing well.

The comparison that works is internal. Your campaign against your own baseline, on a similar segment with the same reply definition, answers the question the benchmark was being used for and does it with data that applies.