On 13/09/10 03:40, Mumia W wrote:
Hello. I've configured exim 4.72 in Debian Squeeze to send mail externally though a
smarthost, but now local sending of mail doesn't work as I expect.
My machine is host-1.mydomain.local. How do I get exim to send all mail for
*.mydomain.local to host-1.mydomain.local? In other words, I want mail for
mu...@mydomain.local to go to mu...@host-1.mydomain.local.
How is this done?
PS.
I'm hoping to be able to do this without setting up a name-server locally,
because I've never done that before, and I could mess things up even more.
You should be able to deal with that situation with the exim4
mini-wizard, try 'dpkg-reconfigure exim4-config'. Or you can edit the
file produced by that program, /etc/exim4/update-exim4.conf.conf (not a
mistype) and /etc/mailname and run update-exim4.conf as suggested in the
configuration file. This wizard will have run at the installation of
exim4, but it can be re-run as required.
If you do run the wizard, save a backup copy of the file first, in case
you end up worse off than you started. Also, have a look at man
update-exim4.conf.conf first, which will also help if you are using the
wizard. The questions asked are not all intuitive to someone not
familiar with networked email.
Is exim4 handling mail for your local 'domain' and also a public email
domain? Microsoft recommends using a 'local' or other unrouteable top
level domain, but Linux does not use the same kind of domain concept,
it's workstations are not 'members' of anything (unless you get really
fancy with samba and Kerberos..). Exim4 need be told only about the
public email domain, but can have the 'local' one listed as an
additional final destination for mail (dc_other_hostnames). Make sure
mydomain.local is *not* listed among the relay domains, and that
/etc/mailname contains the mail domain name only, not the mail server's
FQDN.
A local DNS server/cache is not required (and you need to tell the
wizard if there isn't one, or set dc_minimaldns='true'), but if you are
receiving mail by SMTP, using one will greatly improve spam rejection.
If dc_minimaldns is false, exim4 will check for a PTR/A record pair
based on the sender's IP address, and this eliminates almost all spam
from compromised home computers. Don't use a low-cost router as DNS
server unless you have been assured that it is up to the job, as many
are not. I once had a router which could not find AOL's MX record,
though it returned all the others for the domain, and nearly all other
MX records.
--
Joe
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