diff --git a/src/errmsg.h b/src/errmsg.h
index c3de489..860f667 100644
--- a/src/errmsg.h
+++ b/src/errmsg.h
@@ -15,6 +15,7 @@
 #define ERR_SETGID "ERR: setgid()"
 #define ERR_SELECT "ERR: select()"
 #define ERR_CHDIR "ERR: chdir() to working directory failed"
+#define ERR_DAEMON "ERR: daemon()"
 #define ERR_OPEN_TMP_FILE "ERR: opening a tempfile"
 #define ERR_TIMED_OUT "ERR: timed out"
 #define ERR_FORK_FAILED "ERR: cannot fork()"
diff --git a/src/imap.c b/src/imap.c
index 354478b..c3debe2 100644
--- a/src/imap.c
+++ b/src/imap.c
@@ -101,7 +101,7 @@
 
    snprintf(buf, sizeof(buf)-1, "A%d SELECT %s\r\n", *seq, folder);
 
-   n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+   write1(sd, buf, strlen(buf), use_ssl, data->ssl);
    if(read_response(sd, buf, sizeof(buf), seq, data, use_ssl) == 0){
       trimBuffer(buf);
       printf("select cmd error: %s\n", buf);
@@ -161,7 +161,7 @@
       }
 
 
-      n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+      write1(sd, buf, strlen(buf), use_ssl, data->ssl);
 
       readlen = 0;
       nreads = 0;
@@ -264,7 +264,7 @@
 
          if(data->import->remove_after_import == 1 && dryrun == 0){
             snprintf(buf, sizeof(buf)-1, "A%d STORE %d +FLAGS.SILENT (\\Deleted)\r\n", *seq, i);
-            n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+            write1(sd, buf, strlen(buf), use_ssl, data->ssl);
             read_response(sd, buf, sizeof(buf), seq, data, use_ssl);
          }
 
@@ -275,12 +275,12 @@
             tagoklen = strlen(tagok);
 
             snprintf(buf, sizeof(buf)-1, "A%d COPY %d %s\r\n", *seq, i, data->import->move_folder);
-            n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+            write1(sd, buf, strlen(buf), use_ssl, data->ssl);
             read_response(sd, buf, sizeof(buf), seq, data, use_ssl);
 
             if(strncmp(buf, tagok, tagoklen) == 0){
                snprintf(buf, sizeof(buf)-1, "A%d STORE %d +FLAGS.SILENT (\\Deleted)\r\n", *seq, i);
-               n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+               write1(sd, buf, strlen(buf), use_ssl, data->ssl);
                read_response(sd, buf, sizeof(buf), seq, data, use_ssl);
 
             }
@@ -296,7 +296,7 @@
 
    if((data->import->remove_after_import == 1 || data->import->move_folder) && dryrun == 0){
       snprintf(buf, sizeof(buf)-1, "A%d EXPUNGE\r\n", *seq);
-      n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+      write1(sd, buf, strlen(buf), use_ssl, data->ssl);
       read_response(sd, buf, sizeof(buf), seq, data, use_ssl);
    }
 
@@ -351,7 +351,7 @@
    }
 
 
-   n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+   recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
 
 
    /* imap cmd: LOGIN */
diff --git a/src/parser_utils.c b/src/parser_utils.c
index bc94116..5812ed7 100644
--- a/src/parser_utils.c
+++ b/src/parser_utils.c
@@ -220,12 +220,14 @@
          if((len == 5 && (*s == '+' || *s == '-')) || (len == 8 && (strncmp(s, "GMT+", 4) == 0 || strncmp(s, "GMT-", 4) == 0))){
             offset = 0;
             tz = strpbrk(s, "+-");
-            memset(tzh, 0, 4);
-            memset(tzm, 0, 3);
-            strncpy(tzh, tz, 3);
-            strncpy(tzm, tz+3, 2);
-            offset += atoi(tzh) * 3600;
-            offset += atoi(tzm) * 60;
+            if(tz){
+               memset(tzh, 0, 4);
+               memset(tzm, 0, 3);
+               strncpy(tzh, tz, 3);
+               strncpy(tzm, tz+3, 2);
+               offset += atoi(tzh) * 3600;
+               offset += atoi(tzm) * 60;
+            }
             continue;
          }
 
@@ -351,7 +353,7 @@
          if(start){
             *start = '\0';
             if(strlen(p) > 0){
-               strncat(puf, p, sizeof(puf)-1);
+               strncat(puf, p, sizeof(puf)-strlen(puf)-1);
             }
 
             start++;
@@ -386,27 +388,27 @@
                   }
 
                   if(need_encoding == 1 && ret == OK)
-                     strncat(puf, tmpbuf, sizeof(puf)-1);
+                     strncat(puf, tmpbuf, sizeof(puf)-strlen(puf)-1);
                   else 
-                     strncat(puf, s+3, sizeof(puf)-1);
+                     strncat(puf, s+3, sizeof(puf)-strlen(puf)-1);
 
                   p = end + 2;
                }
             }
             else {
-               strncat(puf, start, sizeof(puf)-1);
+               strncat(puf, start, sizeof(puf)-strlen(puf)-1);
 
                break;
             }
          }
          else {
-            strncat(puf, p, sizeof(puf)-1);
+            strncat(puf, p, sizeof(puf)-strlen(puf)-1);
             break;
          }
 
       } while(p);
 
-      if(q) strncat(puf, " ", sizeof(puf)-1);
+      if(q) strncat(puf, " ", sizeof(puf)-strlen(puf)-1);
 
    } while(q);
 
@@ -450,7 +452,7 @@
    if(strlen(state->miscbuf) > 0){
       memset(puf, 0, sizeof(puf));
       strncpy(puf, state->miscbuf, sizeof(puf)-1);
-      strncat(puf, buf, sizeof(puf)-1);
+      strncat(puf, buf, sizeof(puf)-strlen(puf)-1);
 
       memset(buf, 0, MAXBUFSIZE);
       memcpy(buf, puf, MAXBUFSIZE);
@@ -539,7 +541,7 @@
    }
 
    //printf("append last in line:*%s*, html=+%s+, j=%d\n", puf, html, j);
-   if(j > 0){ k += appendHTMLTag(puf, html, pos, state); }
+   if(j > 0){ appendHTMLTag(puf, html, pos, state); }
 
    strcpy(buf, puf);
 }
diff --git a/src/pilerpurge.c b/src/pilerpurge.c
index ba108e0..36b5699 100644
--- a/src/pilerpurge.c
+++ b/src/pilerpurge.c
@@ -104,7 +104,7 @@
    char filename[SMALLBUFSIZE];
    char *a, buf[BIGBUFSIZE-300], update_meta_sql[BIGBUFSIZE], delete_attachment_stmt[BIGBUFSIZE];
    char piler_id[SMALLBUFSIZE], i[BUFLEN];
-   int n=0, len, attachment_id;
+   int n=0, len, attachment_id=0;
 #ifdef HAVE_SUPPORT_FOR_COMPAT_STORAGE_LAYOUT
    struct stat st;
 #endif
@@ -149,6 +149,11 @@
 
    while(p_fetch_results(data->stmt_select_non_referenced_attachments) == OK){
 
+      if(strlen(piler_id) != RND_STR_LEN || attachment_id <= 0){
+         printf("invalid piler_id: '%s.a%d'\n", piler_id, attachment_id);
+         continue;
+      }
+
       snprintf(filename, sizeof(filename)-1, "%s/%02x/%c%c%c/%c%c/%c%c/%s.a%d", cfg->queuedir, cfg->server_id, piler_id[8], piler_id[9], piler_id[10], piler_id[RND_STR_LEN-4], piler_id[RND_STR_LEN-3], piler_id[RND_STR_LEN-2], piler_id[RND_STR_LEN-1], piler_id, attachment_id);
    #ifdef HAVE_SUPPORT_FOR_COMPAT_STORAGE_LAYOUT
       if(stat(filename, &st)){
diff --git a/src/pop3.c b/src/pop3.c
index 7436ba1..cbe7f65 100644
--- a/src/pop3.c
+++ b/src/pop3.c
@@ -75,19 +75,19 @@
    }
 
 
-   n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+   recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
 
 
    snprintf(buf, sizeof(buf)-1, "USER %s\r\n", username);
 
    write1(sd, buf, strlen(buf), use_ssl, data->ssl);
-   n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+   recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
 
 
    snprintf(buf, sizeof(buf)-1, "PASS %s\r\n", password);
 
    write1(sd, buf, strlen(buf), use_ssl, data->ssl);
-   n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+   recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
 
    if(strncmp(buf, "+OK", 3) == 0) return OK;
 
@@ -106,9 +106,9 @@
    data->import->total_messages = 0;
 
    snprintf(buf, sizeof(buf)-1, "STAT\r\n");
-   n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+   write1(sd, buf, strlen(buf), use_ssl, data->ssl);
 
-   n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+   recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
 
    if(strncmp(buf, "+OK ", 4) == 0){
       p = strchr(&buf[4], ' ');
@@ -140,7 +140,7 @@
          return rc;
       }
 
-      n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+      write1(sd, buf, strlen(buf), use_ssl, data->ssl);
 
       readlen = 0;
       pos = 0;
@@ -203,8 +203,8 @@
 
       if(dryrun == 0 && rc == OK && data->import->remove_after_import == 1){
          snprintf(buf, sizeof(buf)-1, "DELE %d\r\n", i);
-         n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
-         n = recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
+         write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+         recvtimeoutssl(sd, buf, sizeof(buf), data->import->timeout, use_ssl, data->ssl);
       }
 
       if(i % 100 == 0){
@@ -224,7 +224,7 @@
 
 
    snprintf(buf, sizeof(buf)-1, "QUIT\r\n");
-   n = write1(sd, buf, strlen(buf), use_ssl, data->ssl);
+   write1(sd, buf, strlen(buf), use_ssl, data->ssl);
 
    if(data->quiet == 0) printf("\n");
 
diff --git a/src/rules.c b/src/rules.c
index 5c2a9cb..7339e05 100644
--- a/src/rules.c
+++ b/src/rules.c
@@ -121,6 +121,8 @@
    char empty = '\0';
    int len;
 
+   if(rule_cond == NULL) return NULL;
+
    if((h = malloc(sizeof(struct rule))) == NULL)
       return NULL;
 
diff --git a/src/session.c b/src/session.c
index 53af2b9..c39bf0b 100644
--- a/src/session.c
+++ b/src/session.c
@@ -300,7 +300,7 @@
                if(puf[n-2] != '\r' && puf[n-1] != '\n'){
                   memmove(puf, puf+pos, n-pos);
                   memset(puf+n-pos, 0, MAXBUFSIZE-n+pos);
-                  i = recvtimeout(new_sd, buf, MAXBUFSIZE, TIMEOUT);
+                  recvtimeout(new_sd, buf, MAXBUFSIZE, TIMEOUT);
                   strncat(puf, buf, MAXBUFSIZE-1-n+pos);
                   if(cfg->verbosity >= _LOG_DEBUG) syslog(LOG_PRIORITY, "%s: partial read: %s", sdata.ttmpfile, puf);
                   pos = 0;
@@ -356,7 +356,7 @@
 
          if(strncasecmp(buf, SMTP_CMD_HELO, strlen(SMTP_CMD_HELO)) == 0){
             if(protocol_state == SMTP_STATE_INIT) protocol_state = SMTP_STATE_HELO;
-            strncat(resp, SMTP_RESP_250_OK, sizeof(resp)-1);
+            strncat(resp, SMTP_RESP_250_OK, sizeof(resp)-strlen(resp)-1);
             continue;
          }
 
@@ -399,7 +399,7 @@
 
 
          if(strncasecmp(buf, SMTP_CMD_NOOP, strlen(SMTP_CMD_NOOP)) == 0){
-            strncat(resp, SMTP_RESP_250_OK, sizeof(resp)-1);
+            strncat(resp, SMTP_RESP_250_OK, sizeof(resp)-strlen(resp)-1);
             continue;
          }
 
@@ -413,7 +413,7 @@
          /* by default send 502 command not implemented message */
 
          syslog(LOG_PRIORITY, "%s: invalid command: *%s*", sdata.ttmpfile, buf);
-         strncat(resp, SMTP_RESP_502_ERR, sizeof(resp)-1);
+         strncat(resp, SMTP_RESP_502_ERR, sizeof(resp)-strlen(resp)-1);
       } while(p);
 
 
diff --git a/src/store.c b/src/store.c
index 078e3db..908a35c 100644
--- a/src/store.c
+++ b/src/store.c
@@ -48,7 +48,7 @@
 
    EVP_CIPHER_CTX ctx;
    unsigned char *outbuf=NULL;
-   int outlen, writelen, tmplen;
+   int outlen=0, writelen, tmplen;
 
    struct timezone tz;
    struct timeval tv1, tv2;
@@ -118,7 +118,7 @@
 
    if(p){
       *p = '.';
-      strncat(s, p, sizeof(s)-1);
+      strncat(s, p, sizeof(s)-strlen(s)-1);
    }
 
 
@@ -131,9 +131,9 @@
       p2 = strrchr(s, '/'); if(!p2) goto ENDE;
       *p2 = '\0';
 
-      rc = mkdir(s, 0750);
+      mkdir(s, 0750);
       *p2 = '/';
-      rc = mkdir(s, 0750);
+      mkdir(s, 0750);
       *p1 = '/';
       rc = mkdir(s, 0770); if(rc == -1) syslog(LOG_PRIORITY, "%s: mkdir %s: error=%s", sdata->ttmpfile, s, strerror(errno));
    }
diff --git a/unit_tests/check_rules.c b/unit_tests/check_rules.c
index a66b27e..3812166 100644
--- a/unit_tests/check_rules.c
+++ b/unit_tests/check_rules.c
@@ -132,7 +132,7 @@
 
       unlink(sdata.tmpframe);
 
-      printf("%s, '%s'\n", rule_test[i].filename, rule);
+      //printf("%s, '%s'\n", rule_test[i].filename, rule);
 
       if(rule == NULL && rule == rule_test[i].expected_result) continue;