Linux PPP HOWTO
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# 25.2. Handling email queues

When the link between two LANs comes up, you may well want to make sure that email that is queued at either end is flushed - sent out to its destination. This is done by adding the appropriate `sendmail` invocation.

Using the bash 'case' statement on an appropriate parameter that pppd passes into the script accomplishes this. For example, this is the `/etc/ppp/ip-up` script I use to handle our WAN links and the link to my home Ethernet (also handled on the same ppp server).

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After the link comes up - the `/etc/ppp/ip-up` script | Up | A sample `/etc/ppp/ip-up` script