On Mon, 30 Mar 2020 13:11:42 +0200 Bastian Blank <bastian+postfix-users=postfix....@waldi.eu.org> wrote:
> On Mon, Mar 23, 2020 at 01:04:44PM -0500, Ranjan Maitra wrote: > > So, I am wondering if I it is possible to have a setup whereby postfix is > > delayed unless/until VPN is up and running. If VPN is down, then I would > > like postfix to be delayed until such time as it comes up. If it is > > possible, how do I go about doing this? Other ideas? > > I would just reject SMTP connections outgoing on your non-VPN interfaces. > > | iptables -A OUTPUT -o $vpn -m tcp --dport 25 -j ACCEPT > | iptables -A OUTPUT -m tcp --dport 25 -j REJECT > Thanks very much! This seems to a very simple solution. And would this delay postfix until VPN is up and running for messages that are sent? Also, just to be clear, I tried echo $vpn with and without VPN connected. I got a blank. Is this expected? (I was expecting the VPN connection to show up when I had VPN running.) Many thanks and best wishes, Ranjan
