smtp <subcommand>
These commands are used for the Simple Message Transport Protocol service (that is, mail). SMTP is a "one-hop" client that delivers mail from the local host to the destinattion server, thus the route must be complete for delivery. To improve reliability, the mail send command checks for access to the destination IP prior to accepting the message.
smtp batch [yes | no] If set smtp will batch the commands into one frame. When off only one command is sent and a response is waited for. Some old and flaky smtp servers cannot handle more than one command at a time. NOS can handle multiple. If you are not hindered by an old smtp server, setting batch reduces bandwidth. However, if you obtain bounced email containing: “>>> DATA <<< 503 Need MAIL before RCPT” you should turn batching off!
smtp dtimeout [<hours>] Default: 0 Displays or sets the number of hours a message will remain in the smtp mqueue before being returned to sender. Delivery attempts are made at "smtp timer" intervals. If <hours> is zero, the message remains in mqueue indefinitely.
smtp gateway [<hostid> | none] Displays or sets the host to be used as a "smart" mail relay. Any mail sent to a host not in the domain.txt file or not found via a nameserver query, will instead be sent to the gateway for forwarding (if #define). To undefine the gateway, specify "none".
smtp hopper [ON | off] Displays or sets the flag used to enable the "hopper" feature. This feature, available when JNOS is compiled with #define HOPPER, will attempt to deliver mail to a router which serves the mail's destination address. The router address is used even when an 'smtp gateway' is defined. This feature should not be enabled when X1J or other routers are used which don't accept SMTP connections. Note that if ##define HOPPER, then JNOS starts with smtp hopper enabled by default. This feature is inherently "dangerous"!
smtp kick [<hostname>] Initiate outgoing mail from the queue. Without hostname; attempt to deliver any pending mail to all systems; with hostname: just to the host specified. This command allows the user to "kick" the mail system manually. This action is periodically invoked by "smtp timer" discussed below. Note that "kick" will initiate only as much activity as it can in one scan -- consider for example 4 messages in queue and "smtp maxclients 3" / "kick" will initiate three simultaneous deliveries leaving the fourth untouched in queue.
smtp kill <jobid> Kill <jobid> and delete the message. If the job is "locked" by the smtp client process, you will be asked to confirm the removal.
smtp list List the current jobs in the mqueue. An "L" means locked and in progress. It is wise to add in autoexec.bat a "del /spool/mqueue/*.lck" command, since JNOS will not remove any pre-existing locks (it assumes other tasks share the mqueue, and dare not remove their locks).
smtp maxclients [<count>] Displays or sets the maximum number of simultaneous outgoing SMTP sessions that will be allowed. The default is 10. Reduce <count> if network congestion is a problem.
smtp maxservers [<count>] Displays or sets the maximum number of simultaneous incoming SMTP sessions that will be allowed. The default is 0, i.e., no limit other than the amount of memory available.
smtp mode [queue | ROUTE] Sets the smtp delivery mode. If 'queue', all messages are left in /spool/rqueue for external forwarding and handling. If 'route', messages are handled and, if for local, appended to a mailbox, or if remote they are forwarded. Default = 'route'
smtp quiet [YES | no] Enables or disables the inclusion of a beep in the message that new mail arrived at this system. See 'smtp trace' below, to enable the printing of a new-mail-arrived message.
smtp t4 [<seconds>] Displays or sets a t4 timer for smtp client (outgoing) sessions so that they will disconnect after a period of inactivity and prevent lockups. Default = 0, i.e., no disconnect timeout.
smtp tdisc [<seconds>] Displays or sets a disconnect timer for smtp server (incoming) sessions so that they will disconnect after a period of inactivity and prevent lockups. Default = 0, i.e., no disconnect timeout.
smtp timer [<seconds>] Displays or sets the interval, between scans of the outbound mail queue. For example, smtp timer 600 will cause the system to check for outgoing mail every 10 minutes and attempt to deliver anything it finds, subject of course to the smtp maxclients limit. Setting a value of zero disables queue scanning altogether. Zero value is recommended for standalone IP gateways that never handle mail, because the activity is wasted and it saves wear and tear on the (floppy) disk drive. Default = 0
smtp trace [<value>] Displays or sets the trace flag in the SMTP client, allowing you to watch SMTP's conversations as it delivers mail on the sysop console. Zero (the default) disables tracing. A trace value of 1 just enables the "new mail for n5knx from < k5arh@w5ddl.ampr.org >". Larger values produce more voluminous trace output.
smtp usemx [yes | NO] Displays or sets a flag enabling or disabling MX record lookups. This can be enabled if a domain server is available in the near distance (reachable). It should be disabled (default) if no domain server is in reach to satisfy the MX query. Note that MX record handling is limited to the five highest-preference hosts. Also, the smtp t4 timer must be set, in order to timeout on non-responsive hosts.