Retry quick setup with local username only

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

@@ -105,6 +105,11 @@ public class EmailProvider {
                         provider.keepalive = xml.getAttributeIntValue(null, "keepalive", 0);
                         provider.link = xml.getAttributeValue(null, "link");
                         provider.type = xml.getAttributeValue(null, "type");
+                        String user = xml.getAttributeValue(null, "user");
+                        if ("local".equals(user))
+                            provider.user = UserType.LOCAL;
+                        else if ("email".equals(user))
+                            provider.user = UserType.EMAIL;
                     } else if ("imap".equals(name)) {
                         provider.imap.host = xml.getAttributeValue(null, "host");
                         provider.imap.port = xml.getAttributeIntValue(null, "port", 0);

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

@@ -57,6 +57,7 @@ import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 
+import javax.mail.AuthenticationFailedException;
 import javax.mail.Folder;
 
 import static android.app.Activity.RESULT_OK;
@@ -254,6 +255,7 @@ public class FragmentQuickSetup extends FragmentBase {
                     args.putString("documentation", provider.documentation.toString());
 
                 String user = (provider.user == EmailProvider.UserType.EMAIL ? email : dparts[0]);
+                Log.i("User type=" + provider.user + " name=" + user);
 
                 List<EntityFolder> folders = new ArrayList<>();
                 long now = new Date().getTime();
@@ -261,7 +263,17 @@ public class FragmentQuickSetup extends FragmentBase {
                 {
                     String protocol = provider.imap.starttls ? "imap" : "imaps";
                     try (MailService iservice = new MailService(context, protocol, null, false, true)) {
+                        try {
+                            iservice.connect(provider.imap.host, provider.imap.port, user, password);
+                        } catch (AuthenticationFailedException ex) {
+                            if (user.contains("@")) {
+                                Log.w(ex);
+                                user = dparts[0];
+                                Log.i("Retry with user=" + user);
                                 iservice.connect(provider.imap.host, provider.imap.port, user, password);
+                            } else
+                                throw ex;
+                        }
 
                         boolean inbox = false;
                         boolean drafts = false;

app/src/main/res/xml/providers.xml

@@ -176,6 +176,7 @@
     <provider
         name="web.de"
         keepalive="9"
+        user="local"
         link="https://hilfe.web.de/pop-imap/imap/imap-serverdaten.html">
         <imap
             host="imap.web.de"