A few days ago I had my server sending mail quite happily. At the moment I am still testing the various services. At some stage over the past few days sending email using Outlook Express has stopped working. It keeps asking for my password. I can send mail using SquirrelMail. The system log contains these entries: saslauthd: do_auth : auth failure: [service=smtp] [realm=mydomain.co.uk] [mech=shadow] [reason=Unknown] (domain changed for security) I've been chasing round in circles for a few hours trying to sort this out. Any help would be gratefully received!