You host your own mailserver (and the provider even lets you), but the external IP address of your DSL/Cable connection is dynamic. So after a few days suddenly you realise there is no connection to the mailserver, and all the mail is bounced back to the senders. Sure makes for a quiet weekend, but not what you intended with this setup.
If you are somehow unable or unwilling to use Dynamic DNS setups, you can use the script below to periodically lookup the external IP address and send it via email, on the internal side of the mailserver ofcourse, to you if it has changed.
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