readme.vlimits

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VPOPMAIL DOMAIN LIMITS                                              (1/15/2004)

* OVERVIEW

    Vpopmail can set certain limits for domains. These limits are stored in 
    the file ".qmailadmin-limits", in the domain's directory (i.e. 
    /home/vpopmail/domains/test.com/.qmailadmin-limits).  Limits can optionally
    be stored in a mysql table (limits) instead when vpopmail is configured 
    with --enable-mysql-limits.  If .qmailadmin-limits does not exist for a 
    domain (or there is no entry for them in the limits table), then 
    ~vpopmail/etc/vlimits.default is used.  ~vpopmail/etc/vlimits.default 
    *must* be present, and is installed with vpopmail automatically.  You may 
    edit it, but do not remove it.

    Items that can be limited include:

    Default Quota for new users (default_quota, in bytes)
    Default Maximum Message Count Quota for new users (default_maxmsgcount)
    Disable POP Access (disable_pop)
    Disable IMAP Access (disable_imap)
    Disable Dialup Access (disable_dialup)
    Disable Password Changing (disable_password_changing)
    Disable External Relay/Roaming Users (disable_external_relay)
    Disable SMTP AUTHORIZATION (disable_smtp)
    Disable SqWebMail Access (disable_webmail)

    The following 2 limits require that you configure vpopmail with 
    --enable-domainquotas=y:

    Quota for Entire Domain (quota, in megabytes)
    Maximum Message Count for Entire Domain (maxmsgcount)

    In addition, you can set QmailAdmin specific limits on the domain 
    administrator (usually postmaster), such as:

    Maximum Number of Pop Accounts (maxpopaccounts)
    Maximum Number of Forwards (maxforwards)
    Maximum Number of Autoresponders (maxautoresponders)
    Maximum Number of Mailing Lists (maxmailinglists))

    The following QmailAdmin specific items are mentioned in the 
    vlimits.default file, but are NOT YET IMPLEMENTED in QmailAdmin:

    perm_account
    perm_alias
    perm_forward
    perm_autoresponder
    perm_maillist
    perm_quota
    perm_defaultquota

* BACKWARDS COMPATIBILITY

    Before Vpopmail 5.4, vpopmail stored some user limits only in the gid 
    field of the user entry, such as NO_POP, NO_IMAP, etc..   When the 
    .qmailadmin-limits file was used by QmailAdmin (prior to 1.2), it treated 
    these limits as *default* limits, and accordingly set the the gid bit flag 
    of the user entry when creating a user.  This is no longer the case since 
    these are now *domain* limits, and not *default* limits.

    The difference with domain limits is that the gid field is not set when a 
    user is created, so modifying .qmailadmin-limits will immediately reflect 
    on all accounts for the domain.  This is accomplished with a new "virtual" 
    vqpasswd field, pw_flags.  pw_flags is a combination of the gid field, and 
    the domain's limits.

    If the pw_flags field is not present, then the gid field is used for 
    backwards compatibility.

    NOTE:  default_quota and default_maxmsgcount use the default approach 
    described above.  It's also important to add that these limits *replace*
    the old configure options --enable-defaultquota and --enable-hardquota.

* CONFIGURATION

    Modification of domain limits is done with vmoddomlimits.  If no arguments 
    are given, then usage is displayed.  The -S argument will show the current 
    domain limits.  For example, if I wanted to set limits on test.com, I 
    could issue:

    vmoddomlimits -P 11 -L 2 -g p -q 10485760 test.com

    The above command will limit an administrator logged into QmailAdmin 
    (postmaster) to 11 pop accounts, and 2 mailing lists.  It will also deny 
    pop access, and set the default quota to 10MB (in bytes).  Here's the 
    output of vmoddomlimits -S test.com:

	###############################################################
	Domain: test.com
	--
	Max Pop Accounts: 11
	Max Aliases: -1
	Max Forwards: -1
	Max Autoresponders: -1
	Max Mailinglists: 2
	GID Flags:
	  NO_POP
	Flags (for commandline): p
	Flags for non postmaster accounts:
	  pop account:            DENY_CREATE  DENY_MODIFY  DENY_DELETE  
	  alias:                  ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  forward:                ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  autoresponder:          ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  mailinglist:            ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  mailinglist users:      ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  mailinglist moderators: ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  quota:                  ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	  default quota:          ALLOW_CREATE ALLOW_MODIFY ALLOW_DELETE 
	Domain Quota: 0 MB
	Default User Quota: 10485760 bytes
	Max Domain Messages: 0
	Default Max Messages per User: 0
	###############################################################
	
	REMINDER: "The Flags for non postmaster accounts:" are NOT yet supported 
    by QmailAdmin

    If you want to edit or show the ~vpopmail/etc/vlimits.default file, just 
    use the -d option with vmoddomlimits program and leave off the domain 
    argument.

    To set unique limits on a single user, you may still manually set the gid
    flag using vmoduser.  The domain limits are applied in addition to the gid
    flag limits.  So, if you want to *remove* limits for a certain user, like
    allow POP access when it is turned off for a whole domain, you'll need to
    set the V_OVERRIDE flag via vmoduser -o [e-mail].  The V_OVERRIDE
    flag will override any domain limits that are in place.  The user's gid
    flag limits will still apply.

* CREDITS

    The original vlimits idea and code was done by Brian Kolaci ([e-mail]).
    This document was written by Bill Shupp ([e-mail]).