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Use iptables to relay a mail server
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| #!/bin/sh | |
| sysctl -w net.ipv4.ip_forward=1 | |
| iptables -t nat -R PREROUTING 1 -p tcp --dport 2587 -j DNAT --to-destination $(host my.mail.server | cut -f4 -d' '):25 | |
| if [ $? -ne 0 ]; then | |
| iptables -t nat -A PREROUTING -p tcp --dport 2587 -j DNAT --to-destination $(host my.mail.server | cut -f4 -d' '):25 | |
| iptables -t nat -A POSTROUTING -j MASQUERADE | |
| fi |
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