CONFIGURING MAIL ROUTING OPTIONS
SMTPC provides several options for routing messages to the Internet. You can define how SMTPC
will route messages to the Internet in this page. Simply follow the steps given below.
- Indicate the Mail Routing method. Select a Name Resolution
from the drop-down list. There are several name resolution options to choose from, namely:
- DNS Only
- DNS Then Host Table
- Host Table Then DNS
- Host Table Only
- Mail Relay Host Only
- Any combination of the DNS or host table lookup can be used regardless of the order.
If the Mail Relay Host Only
routing option is disabled, it is recommended that the DNS
be used if possible, as this usually results to reliable routing and throughput.
- Enter values for the following DNS parameters:
- Maximum number of DNS records
This specifies the maximum number of DNS records cached in the database of the local disk. The DNS cache greatly
improves the throughput of Internet Exchange, particularly when the DNS server(s) are not on a local LAN. The default
value is 1,000,000; which balances throughput against greater disk space used for the cache. A value of zero disables
the DNS caching.
- DNS retries
The number of times a DNS query is retried after the operation has timed out. The default value is 4.
- DNS timeout (seconds)
The length of time in seconds before a DNS request timeout is registered. The default value is 5 seconds.
- Specify the following Mail Relay parameters:
- Primary mail relay host name
The name of the mail relay host that SMTPC will use to forward mail to third parties. The mail relay hosts used
for delivering outbound traffic are not necessarily the same ones used as MX forwarders for incoming traffic although
in some configurations they may coincide. Internet Exchange gives you the ability to define a number of strategies to
deliver mail, some of which involve using a mail relay host as primary or last resource mail router.
- Secondary mail relay host
Using Internet Exchange, it is possible to define a secondary mail relay host that will be used when the primary relay
host for some reason, is unavailable. If this option is enabled, the configured secondary mail relay host is
automatically used as a substitute of the primary mail relay host when the latter is unavailable
- Time interval to try secondary mail relay host
The number of minutes that SMTPC waits for the primary mail relay host before considering it offline and routing the
messages to the secondary mail relay host if the latter is enabled.
- Time interval to retry primary mail relay host
The number of minutes before the machine attempts to revert to the primary mail relay host after the previous attempt
has failed.
- Click the Submit button to implement the settings.