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+.TH s/qmail: qmail-vmailuser 8
+
+.SH "NAME"
+qmail-vmailuser \- recipient maildir validation 
+
+.SH "SYNOPSIS"
+.B qmail-vmailuser
+.I [homedir]
+.I [-C]
+.SH "DESCRIPTION"
+.B qmail-vmailuser
+is a maildir verification PAM supporting 
+.I VMailMgr 
+and 
+.I Vpopmail 
+users for virtual domains.
+Invoked via 
+.BR qmail-smtpd 's
+recipient mechanism, it checks the
+existence of the recipient directory
+for the provisioned virtual users in
+.IR SQMAIL/control/virtualusers . 
+
+.B qmail-vmailuser
+follows 
+.BR checkpassword 's
+interface specification evaluating the 
+SMTP forwarding path (RCPT TO:) taken from 
+discriptor 3 with a length of max 128 bytes.
+
+The forwarding path 
+.I vuser@domain
+is tokenized to determine the 
+virtual user in
+.I SQMAIL/control/virtualusers
+given by
+.I domain
+in the first step and then validating for
+.I vuser
+the existance of (v)user's mail directory
+in lower case while substituting dots by colons.
+.SH "USAGE" 
+.B qmail-vmailuser
+is called as PAM from
+.BR qmail-smtpd 's
+control file
+.IR SQMAIL/control/recipients :
+
+.EX
+  domain|bin/qmail-vmailuser
+  *|bin/qmail-vmailuser /homedir -C
+.EE
+
+No specific settings are required to support
+either 
+.I VMailMgr 
+or 
+.IR Vpopmail , 
+except for the 
+.I homedir 
+and perhaps the option
+.I -C
+evaluating 
+.I vuser 
+in case respect mode.
+Since
+.I homedir 
+defaults mostly to
+.IR /home ,
+this argument can be omitted.
+.SH "SECURITY"
+For successfull operation
+.B qmail-vmailuser
+requires to stat
+.IR vuser 's
+directory though without reading 
+it's actual contents. Due to
+restrictions given by 
+.IR Vpopmail ,
+.B qmail-vmailuser
+needs to belong to 
+.I vpopmail:vchkpw
+or gnerally to be
+root-owned and 'sticky'.
+.SH "RETURN CODES"
+If for the provided
+.I vuser@domain
+the user directory does not exist
+.B qmail-vmailuser
+exits 1.
+If
+.B qmail-vmailuser
+is misused, it may instead exit 2.
+If there is a temporary problem,
+.B qmail-vmailuser
+exits 111.
+In case
+.B qmail-vmailuser
+can't read
+.I SQMAIL/control/recipients
+it exits 110.
+.SH "SEE ALSO"
+addresses(5),
+envelopes(5),
+qmail-send(8),
+qmail-smtpd(8),
+qmail-recipients(8),
+qmail-authuser(8).