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Please see the full documentation of each keyword for platform availability.
Keywords not hyperlinked are obscure, undocumented z/VM-only settings. If you are a z/VM site and need help with these settings, please contact L-Soft customer support.
If the "Introduced" column is blank, the keyword existed prior to LISTSERV 1.8d (13).
| Keyword | Introduced | Abstract | 
| 1.8d (13) | Determines whether or not the non-z/VM SEARCH command is enabled. | |
|  | It is possible (but not recommended) to set non-default directory paths for LISTSERV files by using the .SD parameter. | |
| 16.5 | (HPO) Space-separated list of list names for which search-related files should be preloaded | |
| 15.5 | Boolean value determining whether or not personal LISTSERV passwords are encrypted in the SIGNUP files. Turned ON by default starting with 15.5. | |
| 1.8b (11) | The Internet hostname of the server to which all outgoing SMTP mail should be forwarded for delivery | |
| 1.8b (11) | Defines n number of "SMTP workers" used to split up the SMTP forwarding load | |
|  | (Windows) Dotted-decimal IP address which sets the IP address to which the SMTPL.EXE "listener" will bind at boot time. | |
|  | (Windows) Integer value which sets the port number to which the SMTPL.EXE "listener" will bind at boot time | |
| 15.0 | (HPO non-z/VM only) Defines bandwidth limits for the server. Typically used with delivery pools, but can be used to set a server-wide bandwidth limit. | |
| 1.8b (11) | Directs LISTSERV to reset open SMTP connections every n minutes | |
| 16.0 | Configuration variable for SMTPL-level spam checking. | |
| 16.0 | Configuration variable for SMTPL-level spam checking. | |
| 16.0 | Configuration variable for SMTPL-level spam checking. | |
| 1.8c (12) | Determines whether or not to sort recipients in the RFC821 mail envelope | |
| 14.2 | Determines whether or not spam reports are sent to the postmaster | |
| 1.8c (12) | Sets the server-wide value (in minutes) for the anti-spam quarantine period | |
| 14.3 | Sets the name of the user-provided exit program used to call a third-party spam scanner. | |
| 16.0 | Determines the action(s) to take when LISTSERV receives spam complaints via AOL feedback loops | |
| 15.5 | Determines whether to enable AOL Feedback Loop Auto-Processing. | |
| 14.3 | Sets the maximum size, in kilobytes, of any message to be handled by the spam scanner. Messages over the specified size are not scanned. | |
| 14.3 | How to set up spam blacklists and whitelists (14.3) | |
| SSI |  | Flag telling LISTSERV that it runs in a SSI system | 
| STARTMSG |  | Recipients of start and stop messages | 
| 16.0-2017a | Determines how often (in days) LISTSERV runs its spool cleanup routine | |
|  | The password to be used by postmasters when executing CP/CMS commands and when storing files in the server by means of the PUTC command | |
| 1.8d-2000b (13.2) | Enables a system-level changelog | 
