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-rw-r--r--lib/smtp.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/smtp.c b/lib/smtp.c
index c02c9bdd4..fa5452aff 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -912,10 +912,11 @@ static CURLcode smtp_mail(struct connectdata *conn)
/* calculate the optional AUTH parameter */
if(data->set.str[STRING_MAIL_AUTH] && conn->proto.smtpc.authused) {
- if(data->set.str[STRING_MAIL_AUTH][0] == '<')
+ if(data->set.str[STRING_MAIL_AUTH][0] != '\0')
auth = aprintf("%s", data->set.str[STRING_MAIL_AUTH]);
else
- auth = aprintf("<%s>", data->set.str[STRING_MAIL_AUTH]);
+ /* empty AUTH, RFC-2554, sect. 5 */
+ auth = strdup("<>");
if(!auth) {
Curl_safefree(from);