Sendmail 8.14.5/8.14.5 on fbsd-9.1R (EC2)
doug at fledge.watson.org
Sat Apr 27 16:43:39 UTC 2013
On Sat, 27 Apr 2013, Matthew Seaman wrote:
> 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.
If sendmail is listening on port 587, it will relay for any valid sender who can
reach that port.
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