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Bypassing ISP Port 25 blocking
For anyone interested, I've figured out the easiest way to bypass port 25 SMTP blocking. (this was imperative for our company as we have a large sales force that is not very technically proficient and are constantly switching ISPs).
Iptables is required for this. Essentially, I just added an iptable rule that accepted smtp connections on port 3025 and then routed them to port 25 internally.
/sbin/iptables -t nat -I PREROUTING -p tcp --dport 3025 -j REDIRECT --to-port 25
Sounds simple but it took me a while to get this right. I came across tons of long winded howtos regarding this but this was the simplest (assuming you already had a working email server in place)
Where are we going and why am I in this handbasket?
(No trees were killed in posting this message. However, a large number of electrons were seriously inconvenienced.)
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Debian user since Potato
Syngin: Web Portfolio
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Or just use smtpauth... runs on 589 IIRC..
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