diff --git a/src/java/davmail/exchange/ExchangeSessionFactory.java b/src/java/davmail/exchange/ExchangeSessionFactory.java
index a63a093b..219c893f 100644
--- a/src/java/davmail/exchange/ExchangeSessionFactory.java
+++ b/src/java/davmail/exchange/ExchangeSessionFactory.java
@@ -116,6 +116,8 @@ public final class ExchangeSessionFactory {
             errorSent = false;
         } catch (DavMailAuthenticationException exc) {
             throw exc;
+        } catch (DavMailException exc) {
+            throw exc;
         } catch (Exception exc) {
             handleNetworkDown(exc);
         }