17 lines
315 B
Bash
17 lines
315 B
Bash
#!/bin/sh
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IP=$(curl ifconfig.me)
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curl_retval=$?
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if [ $curl_retval -gt 0 ]
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# TODO send warning email to postmaster here
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exit 1
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fi
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host_answer=$(host "$IP")
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rev_dns="${host_answer##* }"
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rev_dns="${rev_dns%.}"
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echo "Rev. DNS is: $rev_dns"
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sed -e "s/^myhostname.*/myhostname = $rev_dns/" -i /etc/postfix/main.cf
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