diff --git a/internal/users/credentials/credentials.go b/internal/users/credentials/credentials.go
index 32d9e482..4e6e968b 100644
--- a/internal/users/credentials/credentials.go
+++ b/internal/users/credentials/credentials.go
@@ -143,6 +143,11 @@ func (s *Credentials) CheckPassword(password string) error {
 
 func (s *Credentials) Logout() {
 	s.APIToken = ""
+
+	for i := range s.MailboxPassword {
+		s.MailboxPassword[i] = 0
+	}
+
 	s.MailboxPassword = []byte{}
 }