Sendmail 8.14.5/8.14.5 on fbsd-9.1R (EC2)
matthew at FreeBSD.org
Sat Apr 27 17:14:07 UTC 2013
On 27/04/2013 17:43, doug wrote:
>>> DAEMON_OPTIONS(`Port=587, Addr= 111.222.333.444, Name=MSA, M=E')
> If sendmail is listening on port 587, it will relay for any valid sender
> who can reach that port.
You see where it says 'M=E' in that DAEMON_OPTIONS line? That should
probably be changed to 'M=Ea' meaning 'require authentication'. That's
usually the right thing to do for a message submission agent, and the
use of authentication will allow senders to relay through the daemon
without the usual anti-relaying checks.
Dr Matthew J Seaman MA, D.Phil.
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