diff --git a/pkg/email/config.go b/pkg/email/config.go
index b11bc65..ddaa08b 100644
--- a/pkg/email/config.go
+++ b/pkg/email/config.go
@@ -3,6 +3,7 @@ package email
 import (
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/emersion/go-imap/client"
 	"github.com/joho/godotenv"
@@ -44,8 +45,21 @@ func NewConfigFromEnv() (*Config, error) {
 	fetchServer = os.Getenv("IMAP_SERVER")
 	sendServer = os.Getenv("SMTP_SERVER")
 
-	if len(username) == 0 || len(password) == 0 || len(fetchServer) == 0 || len(sendServer) == 0 {
-		return nil, fmt.Errorf("missing configuration variables")
+	var missing []string
+	if len(username) == 0 {
+		missing = append(missing, "EMAIL_USERNAME")
+	}
+	if len(password) == 0 {
+		missing = append(missing, "EMAIL_PASSWORD")
+	}
+	if len(fetchServer) == 0 {
+		missing = append(missing, "IMAP_SERVER")
+	}
+	if len(sendServer) == 0 {
+		missing = append(missing, "SMTP_SERVER")
+	}
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("missing configuration variables: %s", strings.Join(missing, ", "))
 	}
 
 	return NewConfig(username, password, fetchServer, sendServer), nil