sendmail: using sendmail as submitting MTA

[Bernt Hansson]

https://www.safaribooksonline.com/library/view/sendmail-cookbook/0596004710/ch03s03.html

On 2016-06-27 12:03, O. Hartmann wrote:
> We use a monitoring server (icinga2) based on FreeBSD embedded in a closed
> network (no external access) with a M$ mailexchange server.
>
> I try to configure local sendmail in a way so that all email going to the
> localhost are delivered to the local machine itself, but email for an external
> email account is passed to the mail hub server. This mail hub server is
> accessible by any host in the closed network without authentication (this is
> given by a higher instance as a fact I can not change).
>
> I tried to figure out with the recent handbook but the explanation of how to
> configure sendmail is really poor. Since I'm not that familiar with sendmail
> itself anymore, I appreciate some startups here.
>
> As I understand the docs, the files
>
> hostname.localdomain.mc
>
> and
>
> hostname.localdomain.submit.mc
>
> are the only ones I need to touch, along with
>
> mailertable
>
> for the resolution of the target domain and the mail-hub server to contact.
>
> The target email domain would be foobar.bla, so I use an entry in mailertable
> like
>
> foobar.bla	esmtp:[IP4] (no MX record usage)
> .foobar.bla	esmtp:[IP4]
>
> There is no suitable access to a DNS for MX resolution (all Microsoft crap), so
> I have an /etc/host entry for the mailhub server - or mail relaying server. But
> nothing works so far. Checking the mail queue with mailq gives me always on all
> outbound emails
>
> host map: lookup (foobar.bka): deferred
>
> What is wrong?
>
> Please CC me, I' do not subscribe this specific list.
>
> Thank you in advance,
>
> Oliver
>
> P.S. I ggoled for that specific error and got lots of how-tos but it seems that
> none of them worked so far. I guess I miss something. I already did a
>
> make all install
>
> in /etc/mail after every change.
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