diff --git a/src/parser.c b/src/parser.c
index 5a9f146..6cd46ca 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -661,6 +661,8 @@
 
 
       if(state->message_state == MSG_FROM && state->is_1st_header == 1 && strlen(state->b_from) < SMALLBUFSIZE-len-1){
+         strtolower(puf);
+
          memcpy(&(state->b_from[strlen(state->b_from)]), puf, len);
 
          if(does_it_seem_like_an_email_address(puf) == 1 && state->b_from_domain[0] == '\0' && len > 5){