On Sat, Sep 26, 2009 at 05:36:30PM +0200, Sven Strickroth wrote:
> Am 26.09.2009 16:18 schrieb Wietse Venema:
> > OK, so you send out IP packets with your static IP source address
> > out over the dynamic interface.
>
> no, and there's the problem. if the static-ip connection is down,
> postfix reports "warning: smtp_connect_addr: bind x.x.x.x: Cannot assign
> requested address" and then it binds to the dynamic ip and uses that.
>
> Why not add an option so that if the binding to the smtp_bind_address
> fails that postfix refuses to send mail.
Add filters to block outbound port 25 on the dynamic interface. Pretend
your ISP has already done that for you (as many do).
--
Viktor.
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