I have following problem:
CRM system running on Linux computer is sending emails via sendmail.
I would like to change destination port from 25 to 587 using iptables but without modifing sendmail (not possible due to crm configuration).
I tried to use iptables but mine tries of redirecting packet on output chain to port 587 were unsuccessfull.
You said you don t want to modify sendmail, so I m assuming that sendmail has to run on port 25, but you want clients to be able to connect to it through port 587.
This incantation should do that for you:
$ iptables -t nat -A PREROUTING -p tcp --dport 587 -j REDIRECT --to-port 25
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