Receive before sending

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

@@ -76,6 +76,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 
+import javax.mail.Folder;
 import javax.mail.internet.AddressException;
 import javax.mail.internet.InternetAddress;
 
@@ -1115,6 +1116,13 @@ public class FragmentIdentity extends FragmentBase {
                         if (a != null)
                             try (EmailService iaccount = new EmailService(context, a, EmailService.PURPOSE_CHECK, true)) {
                                 iaccount.connect(a);
+                                Folder ifolder = iaccount.getStore().getFolder("INBOX");
+                                ifolder.open(Folder.READ_ONLY);
+                                try {
+                                    ifolder.getMessages();
+                                } finally {
+                                    ifolder.close();
+                                }
                             }
                     }
 

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

@@ -67,6 +67,7 @@ import java.util.concurrent.ExecutorService;
 
 import javax.mail.Address;
 import javax.mail.AuthenticationFailedException;
+import javax.mail.Folder;
 import javax.mail.MessageRemovedException;
 import javax.mail.MessagingException;
 import javax.mail.SendFailedException;
@@ -803,6 +804,13 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
             if (account != null)
                 try (EmailService iaccount = new EmailService(this, account, EmailService.PURPOSE_USE, debug)) {
                     iaccount.connect(account);
+                    Folder ifolder = iaccount.getStore().getFolder("INBOX");
+                    ifolder.open(Folder.READ_ONLY);
+                    try {
+                        ifolder.getMessages();
+                    } finally {
+                        ifolder.close();
+                    }
                 }
 
             EmailService iservice = new EmailService(this, ident, EmailService.PURPOSE_USE, debug);

app/src/main/res/values/strings.xml

@@ -1245,7 +1245,7 @@
     <string name="title_password">Password</string>
     <string name="title_password_storage">How are passwords stored?</string>
     <string name="title_case_sensitive">Usernames and passwords are usually case sensitive</string>
-    <string name="title_login_before_send">Login before sending</string>
+    <string name="title_login_before_send">Receive before sending</string>
     <string name="title_client_certificate">Client certificate</string>
     <string name="title_realm">Realm</string>
     <string name="title_use_ip">Use local IP address instead of host name</string>