diff --git a/blaze822.c b/blaze822.c
index 66019c1..a71cf23 100644
--- a/blaze822.c
+++ b/blaze822.c
@@ -302,7 +302,7 @@ blaze822_addr(char *s, char **dispo, char **addro)
 
 	char *host = strrchr(addr, '@');
 	char *u;
-	if (host && (u = strpbrk(addr, "()<>[]:;@\\,\"")) && u < host) {
+	if (host && (u = strpbrk(addr, "()<>[]:;@\\,\" \t")) && u < host) {
 		// need to "-quote local-part
 
 		ssize_t hlen = strlen(host);