diff --git a/messages.go b/messages.go
index c9f3fda..5df22af 100644
--- a/messages.go
+++ b/messages.go
@@ -795,10 +795,6 @@ func isValid(m *Message) bool {
 }
 
 func (pm *plainMessage) isValid() bool {
-	if pm.from == "" {
-		return false
-	}
-
 	if !validateStringList(pm.cc, false) {
 		return false
 	}
@@ -812,6 +808,10 @@ func (pm *plainMessage) isValid() bool {
 		return true
 	}
 
+	if pm.from == "" {
+		return false
+	}
+
 	if pm.text == "" && pm.html == "" {
 		return false
 	}