Annotate exceptions on check only

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

@@ -85,6 +85,7 @@ public class EmailService implements AutoCloseable {
     private Context context;
     private String protocol;
     private boolean insecure;
+    private int purpose;
     private boolean harden;
     private boolean useip;
     private String ehlo;
@@ -136,6 +137,7 @@ public class EmailService implements AutoCloseable {
         this.context = context.getApplicationContext();
         this.protocol = protocol;
         this.insecure = insecure;
+        this.purpose = purpose;
         this.debug = debug;
 
         properties = MessageHelper.getSessionProperties();
@@ -369,6 +371,7 @@ public class EmailService implements AutoCloseable {
             } else
                 throw ex;
         } catch (MessagingException ex) {
+            if (purpose == PURPOSE_CHECK) {
                 if (port == 995 && !("pop3".equals(protocol) || "pop3s".equals(protocol)))
                     throw new MessagingException(context.getString(R.string.title_service_port), ex);
                 else if (ex.getMessage() != null &&
@@ -382,6 +385,8 @@ public class EmailService implements AutoCloseable {
                     throw new MessagingException(context.getString(R.string.title_service_protocol), ex);
                 else
                     throw ex;
+            } else
+                throw ex;
         }
     }