deliverquota delivers mail to a maildir taking into account any software-imposed quota on the maildir. This manually-enforced quota mechanism is described in the maildirquota(7) and maildirmake(1) manual pages. Instead of setting up your mail server to deliver the message directly to a maildir, configure the mail server to run the deliverquota program in order to deliver the message, and specify the location of the maildir as the argument to deliverquota.
The second argument to deliverquota is optional. If present, quota specifies a new quota setting for this maildir. Specifying quota is equivalent to running maildirmake(1) with the -q option. The second argument to deliverquota is considered obsolete, and may be removed in the future.
deliverquota reads the message from standard input and delivers it to maildir. maildir may specify a path directly to a maildir folder, not the main maildir (as long as the folder was created by the maildirmake(1) command.
The -c option automatically creates the maildir, and all missing parent subdirectories (as 'mkdir -p'). This option should be used with caution.
The -w NsSS="COMMAND" >couriertcpd looks up the existence of A records, for the IP address.
If /n.n.n.n is used, and msg is not specified for at least one -block option for this same zone, couriertcpd will query for existence of ANY records, which should return both TXT and all the A records for this IP address.
If /n.n.n.n is used, and msg is specified for every -block option for this same zone, couriertcpd will query for existence of A records only.
couriertcpd also initializes the following environment variables prior to running program:
The name of the host on the local end of the network connection, looked up in DNS. TCPLOCALHOST will not be set if the IP address of the network connection's local end cannot be found in DNS, or if -nodnslookup option is specified. TCPLOCALHOST will be set to the string softdnserr if the DNS