diff --git a/src/configure/auto_mozilla.rs b/src/configure/auto_mozilla.rs
index 005cc5fcb..1a9a2eeea 100644
--- a/src/configure/auto_mozilla.rs
+++ b/src/configure/auto_mozilla.rs
@@ -1,10 +1,8 @@
-use libc::free;
 use quick_xml;
 use quick_xml::events::{BytesEnd, BytesStart, BytesText};
 
 use crate::constants::*;
 use crate::context::Context;
-use crate::dc_tools::*;
 use crate::login_param::LoginParam;
 
 use super::read_autoconf_file;
@@ -29,21 +27,17 @@ pub unsafe fn moz_autoconfigure(
     url: &str,
     param_in: &LoginParam,
 ) -> Option<LoginParam> {
-    let xml_raw = read_autoconf_file(context, url);
-    if xml_raw.is_null() {
-        return None;
-    }
+    let xml_raw = read_autoconf_file(context, url)?;
 
     // Split address into local part and domain part.
     let p = param_in.addr.find("@");
     if p.is_none() {
-        free(xml_raw as *mut libc::c_void);
         return None;
     }
     let (in_emaillocalpart, in_emaildomain) = param_in.addr.split_at(p.unwrap());
     let in_emaildomain = &in_emaildomain[1..];
 
-    let mut reader = quick_xml::Reader::from_str(as_str(xml_raw));
+    let mut reader = quick_xml::Reader::from_str(&xml_raw);
     reader.trim_text(true);
 
     let mut buf = Vec::new();
@@ -88,11 +82,9 @@ pub unsafe fn moz_autoconfigure(
     {
         let r = moz_ac.out.to_string();
         warn!(context, "Bad or incomplete autoconfig: {}", r,);
-        free(xml_raw as *mut libc::c_void);
         return None;
     }
 
-    free(xml_raw as *mut libc::c_void);
     Some(moz_ac.out)
 }
 
diff --git a/src/configure/auto_outlook.rs b/src/configure/auto_outlook.rs
index 654809194..9e0edad75 100644
--- a/src/configure/auto_outlook.rs
+++ b/src/configure/auto_outlook.rs
@@ -28,7 +28,6 @@ pub unsafe fn outlk_autodiscover(
     url__: &str,
     param_in: &LoginParam,
 ) -> Option<LoginParam> {
-    let mut xml_raw: *mut libc::c_char = ptr::null_mut();
     let mut url = url__.to_string();
     let mut outlk_ad = outlk_autodiscover_t {
         in_0: param_in,
@@ -54,13 +53,8 @@ pub unsafe fn outlk_autodiscover(
             ::std::mem::size_of::<outlk_autodiscover_t>(),
         );
 
-        xml_raw = read_autoconf_file(context, &url);
-        if xml_raw.is_null() {
-            ok_to_continue = false;
-            break;
-        }
-
-        let mut reader = quick_xml::Reader::from_str(as_str(xml_raw));
+        if let Some(xml_raw) = read_autoconf_file(context, &url) {
+        let mut reader = quick_xml::Reader::from_str(&xml_raw);
         reader.trim_text(true);
 
         let mut buf = Vec::new();
@@ -101,9 +95,11 @@ pub unsafe fn outlk_autodiscover(
         url = as_str(outlk_ad.config[5usize]).to_string();
 
         outlk_clean_config(&mut outlk_ad);
-        free(xml_raw as *mut libc::c_void);
-        xml_raw = ptr::null_mut();
         i += 1;
+        } else {
+            ok_to_continue = false;
+            break;
+        }
     }
 
     if ok_to_continue {
@@ -114,13 +110,11 @@ pub unsafe fn outlk_autodiscover(
         {
             let r = outlk_ad.out.to_string();
             warn!(context, "Bad or incomplete autoconfig: {}", r,);
-            free(xml_raw as *mut libc::c_void);
             outlk_clean_config(&mut outlk_ad);
 
             return None;
         }
     }
-    free(xml_raw as *mut libc::c_void);
     outlk_clean_config(&mut outlk_ad);
     if out_null {
         None
diff --git a/src/configure/mod.rs b/src/configure/mod.rs
index 8a0fba1d4..6116babdc 100644
--- a/src/configure/mod.rs
+++ b/src/configure/mod.rs
@@ -633,7 +633,7 @@ pub fn dc_stop_ongoing_process(context: &Context) {
     };
 }
 
-pub fn read_autoconf_file(context: &Context, url: &str) -> *mut libc::c_char {
+pub fn read_autoconf_file(context: &Context, url: &str) -> Option<String> {
     info!(context, "Testing {} ...", url);
 
     match reqwest::Client::new()
@@ -641,11 +641,11 @@ pub fn read_autoconf_file(context: &Context, url: &str) -> *mut libc::c_char {
         .send()
         .and_then(|mut res| res.text())
     {
-        Ok(res) => unsafe { res.strdup() },
+        Ok(res) => Some(res),
         Err(_err) => {
             info!(context, "Can\'t read file.",);
 
-            std::ptr::null_mut()
+            None
         }
     }
 }