Sendmail 8.14.5/8.14.5 on fbsd-9.1R (EC2)
m.seaman at infracaninophile.co.uk
Sat Apr 27 08:39:50 UTC 2013
On 26/04/2013 16:51, jflowers wrote:
> All I want to do is have the MTA listen on 127.0.0.1 port 1025 and have no
> sendmail process listen on the server interface. That's being done by assp
> which proxies messages to 127.0.0.1:1025. Unfortunately, I haven't been able
> to figure out how to turn off the default. Sockstat shows:
> root sendmail 1672 4 tcp4 *:25 *:*
> root sendmail 1672 5 tcp6 *:25 *:*
> root sendmail 1672 6 tcp4 127.0.0.1:1025 *:*
> root sendmail 1672 7 tcp4 111.222.333.444:587 *:*
> The relevant mc entries are:
> DAEMON_OPTIONS(`Name=IPv4, Family=inet')
> DAEMON_OPTIONS(`Name=IPv6, Family=inet6, Modifiers=O')
> DAEMON_OPTIONS(`Port=1025, Addr=127.0.0.1, Name=MTA')
> DAEMON_OPTIONS(`Port=587, Addr= 111.222.333.444, Name=MSA, M=E')
> The MSA isn't strictly necessary now but I thought might have a future use.
> So, what am I missing? How do I turn *:25 off so that when assp goes down (as
> it frequently does) I'm not running an open relay (all user/domain validation
> is done in assp).
> Any pointers in the right direction appreciated.
You pretty much already have the answer already. Add 'Addr=127.0.0.1'
or 'Addr=::1' clauses to your first two DAEMON_OPTIONS lines. That will
limit sendmail to listening on port 25 only on the loopback interface.
Or indeed, remove those two lines entirely to leave sendmail only
listening on port 587. This should not prevent sendmail from sending
outgoing messages, but will prevent any incoming.
Dr Matthew J Seaman MA, D.Phil.
JID: matthew at infracaninophile.co.uk
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