Question about sendmail...

[Philip Prindeville]

Alexander Dalloz wrote:

>Am Fr, den 28.10.2005 schrieb Philip Prindeville um 4:26:
>
>  
>
>>I'm running FC3 (updated) on a handful of machines.
>>
>>I have a single IP address, with a NATing router set to that
>>address.  I have a domain, and an MX which points through
>>the router at my mail server (or rather, the router is configured
>>to port-forward 25, 143, etc to the mail server).
>>
>>I also have several mail clients on my 192.168.1.x network.
>>
>>The issues are the following:
>>
>>* the clients have a smart host (DS) defined as the mail relay,
>>   but they canonical its name and then look it up in the DNS,
>>   trying to contact it on the external IP address (and not its
>>   internal 192.168.1.x address in the /etc/hosts file).  My
>>   /etc/nsswitch.conf file is unmodified.
>>
>>* the clients then try to relay the email with a sender's envelope
>>   address as user at host.my-domain, which the relay rejects
>>   because "host.my-domain" doesn't resolve in the DNS.
>>
>>* I should probably have define(`LOCAL_RELAY', `:$S') to
>>   handle forwarding everything to the mail server.
>>
>>I used to know all of this stuff once upon a time...
>>    
>>
>
>  
>
>>-Philip
>>    
>>
>
>Reading this I have the strong feeling it was you I was talking to in
>#sendmail on freenode this evening (night) :)
>  
>

Wasn't me.


>I would vote for running a local DNS (bind) service, in conjunction with
>DHCP and dynamic zone updates. That would be ideal. And for unqualified
>sender addresses use the masquerading features of Sendmail.
>
>On the other hand you may go this route: do not run local Sendmail
>daemons, but use the submission process to directly feed outgoing mail
>from inner clients to the central mail hub. Have a look at
>/etc/mail/submit.mc. Comment out (remove the leading "dnl") for
>
>define(`confDIRECT_SUBMISSION_MODIFIERS',`C')
>
>and even add a line
>
>FEATURE(`nocanonify', `canonify_hosts')
>  
>

I'll try it.  BTW:  What does:

define(`confBIND_OPTS',`-DNSRCH -DEFNAMES')dnl

do?  The README isn't very clear on that...


>and finally change the IP in
>
>FEATURE(`msp', `[127.0.0.1]')dnl
>
>to the one of the central mail hub.
>  
>

If I do this, can I change "QUEUE=" in /etc/sysconfig/sendmail?

-Philip

>Please see http://www.sendmail.org/m4/msp.html or better the current
>cf/README coming with your Sendmail on Fedora. Many discussion about
>this topic to be found through
>
>http://groups.google.com/groups?hl=en&lr=&c2coff=1&sa=X&oi=groupst&q=Sendmail+confDIRECT_SUBMISSION_MODIFIERS
>
>Hope it helps.
>
>Alexander
>
>
>  
>