[Mimedefang] Locking down sendmail from behind a filtering gateway
John Von Essen
john at quonix.net
Thu Feb 19 10:26:17 EST 2015
Also work? That would make a lot cleaner of a setup. Its a live production server, so I have to find a time to test the syntax.
On Feb 17, 2015, at 4:33 PM, Kees Theunissen <C.J.Theunissen at differ.nl> wrote:
> On Tue, 17 Feb 2015, John Von Essen wrote:
>> Initially I thought I could do this with the access table, i.e.
>> Connect:1 REJECT
>> Connect:2 REJECT
>> Connect:254 REJECT
>> Connect:127.0.0.1 OK
>> Connect: X.X.X.X OK
>> Where X.X.X.X is the IP of my filtering gateway. I ?think? the above
>> works, I did it once before a long time ago. But the problem is my mail
>> server is also IPv6, so doing the above for IPv6 is not practical.
>> Any thoughts, the filtering gateways only have 1 NIC. Worst case, I can
>> put a firewall on the mail server, but I didn?t want to have to do that.
>> Is there a way to make sendmail deny everything by default?
> Not tested but the line below should work as catch-all rule for IPv6.
> Connect:IPv6 REJECT
> Kees Theunissen.
> Kees Theunissen, System and network manager, Tel: +31 (0)30 6096724
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