fixed the notification service error when the user's display name contained special characters

services/notifications/pkg/config/parser/parse.go

@@ -3,6 +3,8 @@ package parser
 import (
 	"errors"
 	"fmt"
+	"net/mail"
+	"strings"
 
 	ociscfg "github.com/owncloud/ocis/v2/ocis-pkg/config"
 	"github.com/owncloud/ocis/v2/ocis-pkg/shared"
@@ -54,6 +56,17 @@ func Validate(cfg *config.Config) error {
 		}
 	}
 
+	{
+		if strings.TrimSpace(cfg.Notifications.SMTP.Sender) == "" {
+			return fmt.Errorf("the 'smtp_sender' must be a valid single RFC 5322 address. parsing error: the address cannot be empty")
+		}
+		if s, err := mail.ParseAddress(cfg.Notifications.SMTP.Sender); err == nil {
+			cfg.Notifications.SMTP.Sender = s.String()
+		} else {
+			return fmt.Errorf("the 'smtp_sender' must be a valid single RFC 5322 address. parsing error %w", err)
+		}
+	}
+
 	if cfg.ServiceAccount.ServiceAccountID == "" {
 		return shared.MissingServiceAccountID(cfg.Service.Name)
 	}