Try to lock strict TLS if certificate checks are automatic

src/configure/auto_mozilla.rs

@@ -243,6 +243,7 @@ fn parse_serverparams(in_emailaddr: &str, xml_raw: &str) -> Result<Vec<ServerPar
                 hostname: server.hostname,
                 port: server.port,
                 username: server.username,
+                strict_tls: None,
             })
         })
         .collect();