Can anybody tell me what is happening here? Is it a problem with permissions? If yes, permissions of what file?
Make sure your SMTP server is running as the vpopmail user.
Make sure qmail-smtpd has the correct SMTP AUTH patch to match your vpopmail installation. At some point leading up to the 5.4 release, we fixed a bug in vchkpw related to CRAM-MD5 SMTP AUTH. But, you need to use the correct (bug-fixed) SMTP AUTH patch to qmail-smtpd to go with it.
-- Tom Collins - [EMAIL PROTECTED] QmailAdmin: http://qmailadmin.sf.net/ Vpopmail: http://vpopmail.sf.net/ Info on the Sniffter hand-held Network Tester: http://sniffter.com/