Mark Alan:
> Hello,
>
> While using Postfix 2.9.3, iptables 1.4.12, under Ubuntu 12.04 LTS,
> after upgrading to Postfix 2.9.x, using
> grep -I ' FW ' /var/log/syslog*|sort|grep 'DPT=[0-9]\+'
> I am now finding a lot of syslog entries like these:
>
> /var/log/syslog:Jul 27 12:00:32 mx kernel: [485xxx.xxxxx] FW
> DROP-OUT IN= OUT=eth0 SRC=xx.xxx.xxx.xx DST=xxx.xx.xxx.xx LEN=77
> TOS=0x00 PREC=0x00 TTL=64 ID=xxxxx DF PROTO=TCP SPT=xxxxx DPT=25
> WINDOW=26280 RES=0x00 ACK PSH URGP=0
>
> Using time and SRC= DST= ip's, I am sure that these packets are sent by
> Postfix.
I have news for you: Postfix does not send packets. Instead, the
TCP/IP stack in the kernel sends packets. All packet-specific state
is managed by the kernel, well outside the control of Postfix.
Wietse
