diff --git a/src/dc_mimefactory.rs b/src/dc_mimefactory.rs
index cf9e095a0..e15a3a5e9 100644
--- a/src/dc_mimefactory.rs
+++ b/src/dc_mimefactory.rs
@@ -148,7 +148,7 @@ pub unsafe fn dc_mimefactory_load_msg(
                     for row in rows {
                         let (authname, addr) = row?;
                         let addr_c = addr.strdup();
-                        if clist_search_string_nocase(factory.recipients_addr, addr_c) == 0 {
+                        if !clist_search_string_nocase(factory.recipients_addr, addr_c) {
                             clist_insert_after(
                                 factory.recipients_names,
                                 (*factory.recipients_names).last,
@@ -183,7 +183,7 @@ pub unsafe fn dc_mimefactory_load_msg(
                 .unwrap_or_default();
 
             if !email_to_remove.is_empty() && email_to_remove != self_addr {
-                if clist_search_string_nocase(factory.recipients_addr, email_to_remove_c) == 0 {
+                if !clist_search_string_nocase(factory.recipients_addr, email_to_remove_c) {
                     clist_insert_after(
                         factory.recipients_names,
                         (*factory.recipients_names).last,
diff --git a/src/dc_tools.rs b/src/dc_tools.rs
index c2b0bc7ef..6fa6135e0 100644
--- a/src/dc_tools.rs
+++ b/src/dc_tools.rs
@@ -435,13 +435,10 @@ pub unsafe fn clist_free_content(haystack: *const clist) {
 pub unsafe fn clist_search_string_nocase(
     haystack: *const clist,
     needle: *const libc::c_char,
-) -> libc::c_int {
-    for data in &*haystack {
-        if strcasecmp(data.cast(), needle) == 0 {
-            return 1;
-        }
-    }
-    0
+) -> bool {
+    (&*haystack)
+        .into_iter()
+        .any(|data| strcasecmp(data.cast(), needle) == 0)
 }
 
 /* date/time tools */
diff --git a/src/job.rs b/src/job.rs
index bacb73c1b..066e0eac4 100644
--- a/src/job.rs
+++ b/src/job.rs
@@ -692,9 +692,7 @@ pub unsafe fn job_send_msg(context: &Context, msg_id: uint32_t) -> libc::c_int {
             );
         } else {
             /* unrecoverable */
-            if clist_search_string_nocase(mimefactory.recipients_addr, mimefactory.from_addr)
-                == 0i32
-            {
+            if !clist_search_string_nocase(mimefactory.recipients_addr, mimefactory.from_addr) {
                 clist_insert_after(
                     mimefactory.recipients_names,
                     (*mimefactory.recipients_names).last,