Refactoring

app/src/main/java/eu/faircode/email/EntityRule.java

@@ -1019,6 +1019,7 @@ public class EntityRule {
         if (message.from == null)
             return rules;
 
+        List<String> domains = new ArrayList<>();
         for (Address from : message.from) {
             String sender = ((InternetAddress) from).getAddress();
             String name = MessageHelper.formatAddresses(new Address[]{from});
@@ -1029,10 +1030,11 @@ public class EntityRule {
 
             boolean regex = false;
             if (block_domain) {
-                int at = sender.indexOf('@');
-                if (at > 0) {
+                String domain = UriHelper.getEmailDomain(sender);
+                if (!TextUtils.isEmpty(domain) && !domains.contains(domain)) {
+                    domains.add(domain);
                     regex = true;
-                    sender = ".*@.*" + Pattern.quote(sender.substring(at + 1)) + ".*";
+                    sender = ".*@.*" + Pattern.quote(domain) + ".*";
                 }
             }
 

app/src/main/java/eu/faircode/email/FragmentDialogJunk.java

@@ -323,22 +323,21 @@ public class FragmentDialogJunk extends FragmentDialogBase {
             }
         });
 
+        List<String> regex = new ArrayList<>();
+        regex.addAll(COMMON_DOMAINS);
+        regex.addAll(EmailProvider.getDomainNames(context));
+
         boolean common = false;
         List<String> domains = new ArrayList<>();
         if (froms != null)
             for (Address from : froms) {
                 String email = ((InternetAddress) from).getAddress();
-                int at = (email == null ? -1 : email.indexOf('@'));
-                String domain = (at < 0 ? null : email.substring(at + 1).toLowerCase(Locale.ROOT));
-                if (TextUtils.isEmpty(domain))
+                String domain = UriHelper.getEmailDomain(email);
+                if (TextUtils.isEmpty(domain) || domains.contains(domain))
                     continue;
 
                 domains.add(domain);
 
-                List<String> regex = new ArrayList<>();
-                regex.addAll(COMMON_DOMAINS);
-                regex.addAll(EmailProvider.getDomainNames(context));
-
                 for (String r : regex)
                     if (domain.matches(r)) {
                         common = true;