diff --git a/git-codereview/mail.go b/git-codereview/mail.go
index 4607bc1..4c40968 100644
--- a/git-codereview/mail.go
+++ b/git-codereview/mail.go
@@ -193,7 +193,7 @@
 		return
 	}
 	countByAddr := map[string]int{}
-	for _, line := range nonBlankLines(cmdOutput("git", "log", "--format=format:%B")) {
+	for _, line := range nonBlankLines(cmdOutput("git", "log", "--format=format:%B", "-n", "1000")) {
 		if strings.HasPrefix(line, "Reviewed-by:") {
 			f := strings.Fields(line)
 			addr := f[len(f)-1]