Updated FAQ

FAQ.md

@@ -2818,6 +2818,7 @@ The error *User is authenticated but not connected* might occur if:
 
 * The account password was changed: changing it in FairEmail too should fix the problem
 * Push messages are enabled for too many folders: see [this FAQ](#user-content-faq23) for more information and a workaround
+* An alias email address is being used as username instead of the primary email address
 * An incorrect login scheme is being used for a shared mailbox: the right scheme is *username@domain\SharedMailboxAlias*
 
 <br />

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

@@ -508,6 +508,7 @@ public class EmailService implements AutoCloseable {
                     }
                 } catch (MessagingException ex) {
                     Log.w(ex);
+                    // Check for 'User is authenticated but not connected'
                     if (require_id)
                         throw ex;
                 }