diff -Naur cyrus-imapd-2.2.6/imap/imapd.c cyrus-imapd-2.2.6.autocreate.uncompiled/imap/imapd.c
--- cyrus-imapd-2.2.6/imap/imapd.c	2004-05-31 21:21:35.000000000 +0300
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/imap/imapd.c	2004-06-20 14:08:50.000000000 +0300
@@ -149,6 +149,7 @@
 void motd_file(int fd);
 void shut_down(int code);
 void fatal(const char *s, int code);
+void autocreate_inbox(void);
 
 void cmdloop(void);
 void cmd_login(char *tag, char *user);
@@ -1665,6 +1666,43 @@
 }
 
 /*
+ * Autocreate Inbox and subfolders upon login
+ */
+void autocreate_inbox()
+{
+    char inboxname[MAX_MAILBOX_NAME+1];
+    int autocreatequota;
+    int r;
+ 
+    /*
+     * Exlude admin's accounts
+     */
+    if (imapd_userisadmin || imapd_userisproxyadmin)
+        return;
+ 
+    /*
+     * Exclude anonymous
+     */
+    if (!strcmp(imapd_userid, "anonymous"))
+        return;
+ 
+ 
+    if ((autocreatequota = config_getint(IMAPOPT_AUTOCREATEQUOTA))) {
+        /* This is actyally not required
+           as long as the lenght of userid is ok */
+           r = (*imapd_namespace.mboxname_tointernal) (&imapd_namespace,
+                                      "INBOX", imapd_userid, inboxname);
+           if (!r)
+               r = mboxlist_lookup(inboxname, NULL, NULL, NULL);
+ 
+           if (r == IMAP_MAILBOX_NONEXISTENT)
+               mboxlist_autocreateinbox(&imapd_namespace, imapd_userid,
+                         imapd_authstate, inboxname, autocreatequota);
+     }
+}
+
+
+/*
  * Perform a LOGIN command
  */
 void cmd_login(char *tag, char *user)
@@ -1820,6 +1858,9 @@
 				strcspn(imapd_userid, "@") : 0);
 
     freebuf(&passwdbuf);
+
+    autocreate_inbox();
+
     return;
 }
 
@@ -1965,6 +2006,8 @@
 				config_virtdomains ?
 				strcspn(imapd_userid, "@") : 0);
 
+    autocreate_inbox();
+
     return;
 }
 
diff -Naur cyrus-imapd-2.2.6/imap/lmtpd.c cyrus-imapd-2.2.6.autocreate.uncompiled/imap/lmtpd.c
--- cyrus-imapd-2.2.6/imap/lmtpd.c	2004-05-22 06:45:51.000000000 +0300
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/imap/lmtpd.c	2004-06-20 14:08:50.000000000 +0300
@@ -106,6 +106,8 @@
 static FILE *spoolfile(message_data_t *msgdata);
 static void removespool(message_data_t *msgdata);
 
+static int autocreate_inbox(char *rcpt_userid);
+
 /* current namespace */
 static struct namespace lmtpd_namespace;
 
@@ -505,10 +507,52 @@
     exit(code);
 }
 
+/*
+ * Autocreate Inbox and subfolders upon login
+ */
+int autocreate_inbox(char *rcpt_userid)
+{
+    struct auth_state *authstate;
+    char inboxname[MAX_MAILBOX_NAME+1];
+    int rcptisadmin ;
+    int autocreatequota;
+    int r;
+
+    /*
+     * Exclude anonymous
+     */
+    if (!strcmp(rcpt_userid, "anonymous"))
+        return IMAP_MAILBOX_NONEXISTENT;
+
+    /*
+     * Check for autocreatequota and createonpost
+     */
+    if (!(autocreatequota = config_getint(IMAPOPT_AUTOCREATEQUOTA)) ||
+        !(config_getswitch(IMAPOPT_CREATEONPOST)))
+        return IMAP_MAILBOX_NONEXISTENT;
+
+    /*
+     * Exclude admin's accounts
+     */
+     authstate = auth_newstate(rcpt_userid);
+     rcptisadmin = global_authisa(authstate, IMAPOPT_ADMINS);
+     if (rcptisadmin)
+          return IMAP_MAILBOX_NONEXISTENT;
+
+     r = (*lmtpd_namespace.mboxname_tointernal) (&lmtpd_namespace,
+                                "INBOX", rcpt_userid, inboxname);
+     if (!r)
+     r = mboxlist_autocreateinbox(&lmtpd_namespace, rcpt_userid,
+                         authstate, inboxname, autocreatequota);
+     return r;
+}
+
+
 static int verify_user(const char *user, const char *domain, const char *mailbox,
 		       long quotacheck, struct auth_state *authstate)
 {
     char namebuf[MAX_MAILBOX_NAME+1] = "";
+    char *userinbox = NULL;
     int r = 0;
 
     if ((!user && !mailbox) ||
@@ -546,6 +590,23 @@
 	 */
 	r = append_check(namebuf, MAILBOX_FORMAT_NORMAL, authstate,
 			 !user ? ACL_POST : 0, quotacheck > 0 ? 0 : quotacheck);
+        if (r == IMAP_MAILBOX_NONEXISTENT) {
+	    if(domain) {
+		int k;
+		userinbox = (char *) malloc((strlen(user)+strlen(domain)+1)*sizeof(char));
+		k = strlcpy(userinbox, user, strlen(user)+1);
+		*(userinbox + k) = '@';
+		strlcpy(userinbox+k+1, domain, strlen(domain)+1);
+	    }
+	    else userinbox = user;
+            r = autocreate_inbox(userinbox);
+	    if(userinbox != user)
+		free(userinbox);
+	    if (!r)
+                r = append_check(namebuf, MAILBOX_FORMAT_NORMAL, authstate,
+				0, quotacheck > 0 ? 0 : quotacheck);
+    	}
+
     }
 
     if (r) syslog(LOG_DEBUG, "verify_user(%s) failed: %s", namebuf,
diff -Naur cyrus-imapd-2.2.6/imap/mboxlist.c cyrus-imapd-2.2.6.autocreate.uncompiled/imap/mboxlist.c
--- cyrus-imapd-2.2.6/imap/mboxlist.c	2004-05-22 06:45:51.000000000 +0300
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/imap/mboxlist.c	2004-06-20 14:08:50.000000000 +0300
@@ -98,6 +98,10 @@
 static int mboxlist_changequota(const char *name, int matchlen, int maycreate,
 				void *rock);
 
+static int mboxlist_autosubscribe_sharedfolders(struct namespace *namespace,
+                        char *userid,
+                        struct auth_state *auth_state);
+
 struct change_rock {
     struct quota *quota;
     struct txn **tid;
@@ -3108,3 +3112,209 @@
 
     return DB->abort(mbdb, tid);
 }
+
+
+#define SEP '|'
+
+/*
+ * Automatically subscribe user to a shared folder.
+ * Subscription is done successfully, if the shared
+ * folder exists and the user has the necessary 
+ * permissions.
+ */
+static int mboxlist_autosubscribe_sharedfolders(struct namespace *namespace,
+                        char *userid,
+                        struct auth_state *auth_state) {
+        
+    const char *sub ;
+    char *p, *q, *next_sub;
+    char folder [MAX_MAILBOX_NAME+1], name[MAX_MAILBOX_NAME+1], mailboxname[MAX_MAILBOX_NAME+1];
+    int len;
+    int r = 0;
+
+    if ((sub=config_getstring(IMAPOPT_AUTOSUBSCRIBESHAREDFOLDERS)) == NULL)
+       return r;
+
+    next_sub = (char *) sub;
+    while (*next_sub) {
+        for (p = next_sub ; isspace((int) *p) || *p == SEP ; p++);
+        for (next_sub = p ; *next_sub && *next_sub != SEP ; next_sub++);
+        for (q = next_sub ; q > p && (isspace((int) *q) || *q == SEP || !*q) ; q--);
+        if (!*p ) continue;
+
+        len = q - p + 1;
+        /* Check for folder length */
+        if (len  > sizeof(folder)-1)
+                continue;
+
+        if (!r) {
+                strncpy(folder, p, len);
+                folder[len] = NULL;
+
+               strlcpy(name, namespace->prefix[NAMESPACE_SHARED], sizeof(name));
+               len = strlcat(name, folder, sizeof(name));
+
+               r = (namespace->mboxname_tointernal) (namespace, name, userid,
+                                                                  mailboxname);
+       }
+                                                                  
+        if (!r)
+               r = mboxlist_changesub(mailboxname, userid, auth_state, 1, 0);
+
+        if (!r) {
+                syslog(LOG_DEBUG,"autosubscribe: User %s to %s succeeded", 
+                       userid, folder);
+        } else {
+                syslog(LOG_ERR, "autosubscribe: User %s to %s failed: %s", 
+                       userid, folder, error_message(r));
+                r = 0;
+        }
+    }
+
+    return r;
+}
+
+
+
+int mboxlist_autocreateinbox(struct namespace *namespace,
+                        char *userid,
+                        struct auth_state *auth_state,
+                        char *mailboxname, int autocreatequota) {
+    char name [MAX_MAILBOX_NAME+1];
+    char folder [MAX_MAILBOX_NAME+1];
+    char *partition = NULL;
+    const char *crt;
+    const char *sub;
+    char *p, *q, *next_crt, *next_sub;
+    int len;
+    int r = 0;
+    int numcrt = 0;
+    int numsub = 0;
+
+#if 0
+        /*
+         * Get Partition info or return.
+         * (Here you should propably use
+         * you own "get_partition(char *userid)"
+         * function. Otherwise all new INBOXes will be
+         * created into whatever partition has been declared
+         * as default in your imapd.conf)
+         */
+
+        partition = get_partition(userid);
+
+        if (partition == NULL) {
+            /*
+             * Couldn't get partition info
+             */
+            syslog(LOG_WARNING,
+                   "Could not get imapPartition info for user %s", userid);
+            return IMAP_PARTITION_UNKNOWN;
+        }
+#endif
+
+
+    r = mboxlist_createmailbox(mailboxname, MAILBOX_FORMAT_NORMAL, NULL,
+                                      1, userid, auth_state, 0, 0, 0);
+
+    if (!r && autocreatequota > 0)
+        r = mboxlist_setquota(mailboxname, autocreatequota, 0);
+
+    if (!r)
+        r = mboxlist_changesub(mailboxname, userid,
+                              auth_state, 1, 1);
+
+    if (!r)
+       syslog(LOG_NOTICE, "autocreateinbox: User %s, INBOX was successfully created in partition %s", 
+               userid, partition == NULL ? "default" : partition);
+    else {
+       syslog(LOG_ERR, "autocreateinbox: User %s, INBOX failed. %s", 
+               userid, error_message(r));
+       return r;
+    }
+
+    /* INBOX's subfolders */
+    if ((crt=config_getstring(IMAPOPT_AUTOCREATEINBOXFOLDERS)))
+        sub=config_getstring(IMAPOPT_AUTOSUBSCRIBEINBOXFOLDERS);
+
+    /* Roll through crt */
+    next_crt = (char *) crt;
+    while (next_crt!=NULL && *next_crt) {
+          for (p = next_crt ; isspace((int) *p) || *p == SEP ; p++);
+          for (next_crt = p ; *next_crt && *next_crt != SEP ; next_crt++);
+          for (q = next_crt ; q > p && (isspace((int) *q) || *q == SEP || !*q); q--);
+
+          if (!*p) continue;
+
+          len = q - p + 1;
+
+          /* First time we check for length */
+          if (len > sizeof(folder) - 5)
+              r = IMAP_MAILBOX_BADNAME;
+
+          if (!r) {
+                  strncpy(folder, p, len);
+                  folder[len] = '\0';
+
+                  strlcpy(name, namespace->prefix[NAMESPACE_INBOX], sizeof(name));
+                  len = strlcat(name, folder, sizeof(name));
+          }
+
+          if (!r)
+            r = (namespace->mboxname_tointernal) (namespace, name, userid,
+                                                 mailboxname);
+          if (!r)
+             r = mboxlist_createmailbox(mailboxname, MAILBOX_FORMAT_NORMAL, NULL,
+                                            1, userid, auth_state, 0, 0, 0);
+
+
+          if (!r) {
+            numcrt++;
+            syslog(LOG_DEBUG, "autocreateinbox: User %s, subfolder %s creation succeeded.", 
+               userid, name);
+         } else {
+             syslog(LOG_ERR, "autocreateinbox: User %s, subfolder %s creation failed. %s", 
+               userid, name, error_message(r));
+             r=0;
+             continue;
+          }
+
+          /* Roll through sub */
+          next_sub = (char *) sub;
+          while (next_sub!=NULL && *next_sub) {
+                for (p = next_sub ; isspace((int) *p) || *p == SEP ; p++);
+                for (next_sub = p ; *next_sub && *next_sub != SEP ; next_sub++);
+                for (q = next_sub ; q > p && (isspace((int) *q) || *q == SEP || !*q) ; q--);
+                if (!*p ) continue;
+
+                len = q - p + 1;
+
+                if (len != strlen(folder) || strncmp(folder, p, len))
+                    continue;
+
+                r = mboxlist_changesub(mailboxname, userid, auth_state, 1, 1);
+
+               if (!r) {
+                   numsub++;
+                   syslog(LOG_DEBUG,"autocreateinbox: User %s, subscription to %s succeeded",
+                       userid, name);
+               } else
+                    syslog(LOG_ERR, "autocreateinbox: User %s, subscription to  %s failed. %s",
+                       userid, name, error_message(r));
+
+                break;
+         }
+    }
+
+    if (crt!=NULL && *crt)
+       syslog(LOG_INFO, "User %s, Inbox subfolders, created %d, subscribed %d", 
+               userid, numcrt, numsub);
+
+    /*
+     * Check if shared folders are available for subscription.
+     */
+    mboxlist_autosubscribe_sharedfolders(namespace, userid, auth_state);
+
+    return r;
+}
+
diff -Naur cyrus-imapd-2.2.6/imap/mboxlist.h cyrus-imapd-2.2.6.autocreate.uncompiled/imap/mboxlist.h
--- cyrus-imapd-2.2.6/imap/mboxlist.h	2004-03-17 20:07:49.000000000 +0200
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/imap/mboxlist.h	2004-06-20 14:08:50.000000000 +0300
@@ -197,4 +197,10 @@
 int mboxlist_commit(struct txn *tid);
 int mboxlist_abort(struct txn *tid);
 
+int mboxlist_autocreateinbox(struct namespace *namespace,
+                        char *userid,
+                        struct auth_state *auth_state,
+                        char *mailboxname, int autocreatequota);
+
+
 #endif
diff -Naur cyrus-imapd-2.2.6/imap/pop3d.c cyrus-imapd-2.2.6.autocreate.uncompiled/imap/pop3d.c
--- cyrus-imapd-2.2.6/imap/pop3d.c	2004-05-29 08:18:23.000000000 +0300
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/imap/pop3d.c	2004-06-20 14:08:50.000000000 +0300
@@ -150,6 +150,8 @@
 static char popd_apop_chal[45 + MAXHOSTNAMELEN + 1]; /* <rand.time@hostname> */
 static void cmd_apop(char *response);
 
+static int autocreate_inbox(char *inboxname);
+
 static void cmd_auth(char *arg);
 static void cmd_capa(void);
 static void cmd_pass(char *pass);
@@ -1317,6 +1319,43 @@
 }
 
 /*
+ * Autocreate Inbox and subfolders upon login
+ */
+int autocreate_inbox(char *inboxname)
+{
+    struct auth_state *authstate;
+    int userisadmin ;
+    int autocreatequota;
+    int r;
+
+    /*
+     * Exclude anonymous
+     */
+    if (!strcmp(popd_userid, "anonymous"))
+        return IMAP_MAILBOX_NONEXISTENT;
+
+    /*
+     * Check for autocreatequota
+     */
+    if (!(autocreatequota = config_getint(IMAPOPT_AUTOCREATEQUOTA)))
+        return IMAP_MAILBOX_NONEXISTENT;
+
+    /*
+     * Exclude admin's accounts
+     */
+
+     authstate = auth_newstate(popd_userid);
+     userisadmin = global_authisa(authstate, IMAPOPT_ADMINS);
+     if (userisadmin)
+          return IMAP_MAILBOX_NONEXISTENT;
+
+     r = mboxlist_autocreateinbox(&popd_namespace, popd_userid,
+                         authstate, inboxname, autocreatequota);
+     return r;
+}
+
+
+/*
  * Complete the login process by opening and locking the user's inbox
  */
 int openinbox(void)
@@ -1338,6 +1377,11 @@
 					      userid, inboxname);
 
     if (!r) r = mboxlist_detail(inboxname, &type, NULL, &server, NULL, NULL);
+
+    /* Try once again after autocreate_inbox */
+    if (r == IMAP_MAILBOX_NONEXISTENT && !(r = autocreate_inbox(inboxname)))
+        r = mboxlist_detail(inboxname, &type, NULL, &server, NULL, NULL);
+
     if (r) {
 	sleep(3);
 	syslog(LOG_ERR, "Unable to locate maildrop for %s", popd_userid);
diff -Naur cyrus-imapd-2.2.6/lib/imapoptions cyrus-imapd-2.2.6.autocreate.uncompiled/lib/imapoptions
--- cyrus-imapd-2.2.6/lib/imapoptions	2004-05-25 03:03:05.000000000 +0300
+++ cyrus-imapd-2.2.6.autocreate.uncompiled/lib/imapoptions	2004-06-20 14:08:50.000000000 +0300
@@ -165,6 +165,29 @@
 /* Maximum number of transactions to be supported in the berkeley
    environment. */
 
+{ "createonpost", 0, SWITCH }
+/* If yes, when lmtpd receives an incoming mail for an INBOX that does not exist,
+   then the INBOX is automatically created by lmtpd. */
+
+{ "autocreateinboxfolders", NULL, STRING }
+/* If a user does not have an INBOX created then the INBOX as well as some INBOX subfolders are
+   created under two conditions.
+     1. The user logins via the IMAP or the POP3 protocol. (autocreatequota option must have a nonzero value)
+     2. A message arrives for the user through the LMTPD protocol.(createonpost option must yes)
+   autocreateinboxfolders is a list of INBOX's subfolders separated by a "|", that are automatically created by the server
+   under the previous two situations. */
+
+{ "autosubscribeinboxfolders", NULL, STRING }
+/* A list of folder names, separated by "|" that the users get automatically subscribed to, when their INBOX
+  is created.
+  These folder names must have been included in the autocreateinboxfolders option of the imapd.conf. */
+
+{ "autosubscribesharedfolders", NULL, STRING }
+/* A list of shared folders (bulletin boards), separated by "|" that the users get
+   automatically subscribed to, after their INBOX
+   is created. The shared folder must have been created and the user must have the
+   required permissions to get subscribed to the it. Otherwise the subscription fails. */
+
 { "configdirectory", NULL, STRING }
 /* The pathname of the IMAP configuration directory.  This field is
    required. */