[rt-users] strange postmaster messages

[Joseph Spenner]

It appears to only be an issue if the destination
sendmail has more strict security where it tries to do
a DNS lookup prior to accepting the message.  From the
rt box itself, if I simply send an email using my
local sendmail, the behavior is identical to that
through RT:  I can mail myself at yahoo fine (although
the return address will be an unresolvable host) but
sending to the addresses mentioned earlier will result
in a bounce.
So, in order to satisfy the more secure sendmails, I
must have a DNS entry to answer the lookup.  Since my
RT box itself doesn't have a real IP, i'd need to put
something bogus in my DNS for that host, like
127.0.0.1.  Or have my Internet sendmail box take care
of the internal host and rewrite it from
rtbox.mydomain.com to mydomain.com.

Is this correct?


--- Phil Homewood <pdh at snapgear.com> wrote:
> Joseph Spenner wrote:
> > > ... while talking to lte2.domain.com.:
> > > >>> MAIL From:<apache at rtbox.mydomain.com>
> SIZE=3108
> > > <<< 553 5.1.8 <apache at rtbox.mydomain.com>...
> Domain
> > of sender address apache at rtbox.mydomain.com does
> not
> > exist
> 
> The domain "rtbox.mydomain.com" does not exist (in
> DNS.)
> 
> > My RT seems to work fine, and mail flows correctly
> > from outside to inside, and inside to outside, but
> the
> > above type messages I don't understand.  I'm not
> sure
> > if the recipients are receiving the messages
> during
> > the above issue.
> 
> They're not. 553 is a permanent failure code.
> -- 
> Phil Homewood, Systems Janitor,
> http://www.SnapGear.com
> pdh at snapgear.com Ph: +61 7 3435 2810 Fx: +61 7 3891
> 3630
> SnapGear - Custom Embedded Solutions and Security
> Appliances
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> 
> Have you read the FAQ? The RT FAQ Manager lives at
http://fsck.com/rtfm


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