> Let me try to explain what I mean. If I look at netstat output, I can see 
> things like this:
> 
> tcp        0      0 ::ffff:192.168.1.245:25     ::ffff:202.63.164.4:53400 
> ESTABLISHED
> tcp        0      0 ::ffff:192.168.1.245:25     ::ffff:8.12.43.34:2616 
> TIME_WAIT
> tcp       12      0 ::ffff:192.168.1.245:25     ::ffff:200.198.4.21:58613 
> ESTABLISHED

I think you're confused about what netstat is showing you. Here you have
3 connections which (almost certainly) were initiated **from** the IP
and port in the right-hand column **to** your server in the left-hand
column.  The traffic going the other way (your server port 25 back to
the client's random port) will be allowed by connection tracking rules.

-Brad

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