diff --git a/pkgs/mailnix/src/config.rs b/pkgs/mailnix/src/config.rs
index 9e3240f..ce019c3 100644
--- a/pkgs/mailnix/src/config.rs
+++ b/pkgs/mailnix/src/config.rs
@@ -153,42 +153,36 @@ impl Config {
     pub fn merge<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Box<dyn Error>> {
         let mut other = Config::load(path).unwrap();
 
-        if !self
-            .domains
-            .iter()
-            .all(|domain| other.domains.contains(domain))
-        {
-            return Err(
-                "domains: Duplicate entry during merge detected, aborting..."
-                    .to_string()
-                    .into(),
-            );
+        for domain in self.domains.iter() {
+            if other.domains.contains(domain) {
+                return Err(
+                    "domains: Duplicate entry ({domain}) during merge detected, aborting..."
+                        .to_string()
+                        .into(),
+                );
+            }
         }
         self.domains.append(&mut other.domains);
 
-        if !self
-            .accounts
-            .keys()
-            .all(|name| other.accounts.contains_key(name))
-        {
-            return Err(
-                "accounts: Duplicate entry during merge detected, aborting..."
-                    .to_string()
-                    .into(),
-            );
+        for name in self.accounts.keys() {
+            if other.accounts.contains_key(name) {
+                return Err(
+                    "accounts: Duplicate entry ({name}) during merge detected, aborting..."
+                        .to_string()
+                        .into(),
+                );
+            }
         }
         self.accounts.extend(other.accounts);
 
-        if !self
-            .aliases
-            .keys()
-            .all(|alias| other.aliases.contains_key(alias))
-        {
-            return Err(
-                "aliases: Duplicate entry during merge detected, aborting..."
-                    .to_string()
-                    .into(),
-            );
+        for alias in self.aliases.keys() {
+            if other.aliases.contains_key(alias) {
+                return Err(
+                    "aliases: Duplicate entry ({alias}) during merge detected, aborting..."
+                        .to_string()
+                        .into(),
+                );
+            }
         }
         self.aliases.extend(other.aliases);