According to the "Virtual Users And Domains With Postfix, Courier And MySQL (Ubuntu 6.10 Edgy Eft)", I set up the mail server step by step and test ok. Then, I installed the Squirrelmail to provide the webmail for users. The squirrelmail config test seems ok, but none of the virtual email account can login the webmail, always show the "Unknown user or password incorrect." Is there any other configuration needed? Following is the squirrelmail configtest result: SquirrelMail version: 1.4.8 Config file version: 1.4.0 Config file last modified: 20 April 2007 09:15:11 Checking PHP configuration... PHP version 5.1.6 OK. PHP extensions OK. Checking paths... Data dir OK. Attachment dir OK. Plugins are not enabled in config. Themes OK. Default language OK. Base URL detected as: http://localhost/squirrelmail/src (location base autodetected) Checking outgoing mail service.... SMTP server OK (220 mail.cwnxt.com ESMTP Postfix (Ubuntu)) POP-before-SMTP OK. Checking IMAP service.... IMAP server ready (* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2005 Double Precision, Inc. See COPYING for distribution information.) Capabilities: * CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS Checking internationalization (i18n) settings... gettext - Gettext functions are available. You must have appropriate system locales compiled. mbstring - Mbstring functions are available. recode - Recode functions are unavailable. iconv - Iconv functions are available. timezone - Webmail users can change their time zone settings. Checking database functions... not using database functionality. Congratulations, your SquirrelMail setup looks fine to me!
Sorry, found the reason After change the authentication method to "login" in squirrelmail imap setting, the user can login now. The new error is "Connection dropped by IMAP server.", then, fixed by adding to the Maildir subdirectories tmp, new, cur.
