diff --git a/src/message.c b/src/message.c
index 1b281fa..9319e4a 100644
--- a/src/message.c
+++ b/src/message.c
@@ -41,7 +41,7 @@
    fix_email_address_for_sphinx(state->b_sender_domain);
    fix_email_address_for_sphinx(state->b_to_domain);
 
-   if(state->b_sender_domain){
+   if(state->b_sender_domain[0]){
       sender = state->b_sender;
       sender_domain = state->b_sender_domain;
    }
@@ -194,7 +194,7 @@
    subj = state->b_subject;
    if(*subj == ' ') subj++;
 
-   if(state->b_sender_domain){
+   if(state->b_sender_domain[0]){
       sender = state->b_sender;
       sender_domain = state->b_sender_domain;
       get_first_email_address_from_string(state->b_sender, s2, sizeof(s2));