MAIL ROUTING CONFIGURATION
SMTPC provides several options for routing messages to the Internet. This page allows you to set how SMTPC will route messages to the Internet. Simply follow the steps given below.
- Select a Name Resolution method 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.
- Specify the location of the Host table filename for host table domain name resolution.
- 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 IEMS, 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. IEMS 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 IEMS, 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.