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Posted to server-dev@james.apache.org by David Smiley <ds...@mitre.org> on 2002/04/30 19:39:57 UTC
Newsgroup integration, and other questions
[this was sent to james-user and is now being posted here per the suggestion
of Serge]
How well is the NNTP support integrated with the rest of the Matcher/Mailet
processing architecture? I'm hoping I can gateway James newsgroups and
mailing lists together. Is there any docs on what happens with a NNTP
message is received?
Also, shouldn't the articleIDDomainSuffix be different per James server
rather than being the fixed value in the initial configuration
(news.james.apache.org) ? I.E. I think this should be changed to the local
machine name. I'm not a NNTP guru, so I could be wrong on this.
Another few unrelated questions/comments:
1: What's so wrong about sending out single innocent DHCP UDP packet to
query the DNS server on startup? Is that really so bad?
2: James detects that my machine's name is "dsmiley" but it doesn't also
realize that "dsmiley.mitre.org" is also my machine's name. Is it possible
that the RecipientIsLocal matcher could do the DNS lookup of the machine
name if it appears that the DNS name might resolve to the local James? Or
maybe the initial detection could be smarter to know at that time.
3: The "Handling mail for" info log messages in James.log confused me at
first. I think they ought to be worded
differently to clarify that these are machine names, not user names.
4: Where is the NotifySender mailet documented? I looked for it here:
http://jakarta.apache.org/james/configuration_v2_0.html but didn't find it.
Ultimately, I am just curious to make sure that it will try to detect that
messages between two mail servers won't bounce back and forth forever if
there is a configuration problem.
~ David Smiley
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Re: Newsgroup integration, and other questions
Posted by Serge Knystautas <se...@lokitech.com>.
Oh, oh, I see what you mean... well, don't you risk grabbing a lease
that some other machine could use (assuming you're pulling from a pool
of IP addresses)? This might be a cool thing to do though... I don't
know the specifics of the DHCP protocol, but would be nice to have a
conf setting to use DHCP is this would work.
I found this and think I had tested using this once before..
http://www.dhcp.org/javadhcp/ It's GPL so we couldn't use it as is, but
perhaps we could talk to the author about the code... hasn't been
modified since 9/13/99.
--
Serge Knystautas
Loki Technologies - Unstoppable Websites
http://www.lokitech.com/
David Smiley wrote:
>>>1: What's so wrong about sending out single innocent DHCP UDP packet to
>>>query the DNS server on startup? Is that really so bad?
>>
>>Ok, but then what?
>
>
> To find the DNS servers so I don't have to specify this myself in the
> configuration.
>
> ~ David Smiley
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Re: Newsgroup integration, and other questions
Posted by David Smiley <ds...@mitre.org>.
> > 1: What's so wrong about sending out single innocent DHCP UDP packet to
> > query the DNS server on startup? Is that really so bad?
>
> Ok, but then what?
To find the DNS servers so I don't have to specify this myself in the
configuration.
~ David Smiley
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Re: Newsgroup integration, and other questions
Posted by Serge Knystautas <se...@lokitech.com>.
Sorry, meant to just bring up the NNTP support to the dev list. Anyway,
here goes with the other questions...
David Smiley wrote:
> Another few unrelated questions/comments:
> 1: What's so wrong about sending out single innocent DHCP UDP packet to
> query the DNS server on startup? Is that really so bad?
Ok, but then what?
> 2: James detects that my machine's name is "dsmiley" but it doesn't also
> realize that "dsmiley.mitre.org" is also my machine's name. Is it possible
> that the RecipientIsLocal matcher could do the DNS lookup of the machine
> name if it appears that the DNS name might resolve to the local James? Or
> maybe the initial detection could be smarter to know at that time.
Really I think you should be configuring the domains you handle rather
than relying on DNS. I can't think of a way for you to determine every
possible name that could map to your server... reverse DNS will just
give a single address, and there's nothing to stop someone managing
otherdomain.com to point an MX record at the hostname for your server...
no real way to query to determine that ahead of time, and you probably
don't want to allow that anyway. We could also do a dynamic check so
that as you receive emails you do a lookup to see if this is a local
host. However, again you may end up thinking someone is a local
recipient when they're really not, and this is using what is transient
information to make what should be permanent configuration changes,
IMHO. In any case, remote delivery does do this check so it doesn't try
to deliver to itself, to avoid race conditions.
Sorry, I'm rambling. Summary: not possible to make a smarter initial
detection; you're pretty much stuck configuring this.
> 3: The "Handling mail for" info log messages in James.log confused me at
> first. I think they ought to be worded
> differently to clarify that these are machine names, not user names.
I'll look into that. seems to make sense.
> 4: Where is the NotifySender mailet documented? I looked for it here:
> http://jakarta.apache.org/james/configuration_v2_0.html but didn't find it.
> Ultimately, I am just curious to make sure that it will try to detect that
> messages between two mail servers won't bounce back and forth forever if
> there is a configuration problem.
Not really documented anywhere... anyone is free to contribute
documentation though. :) More seriously, James has a check (RelayLimit)
set by default to 30 hops before a message gets killed, in case you
unintentionally relay between 2 servers (although true, if you're
constructing a new notice message, you could see this loop).
> ~ David Smiley
--
Serge Knystautas
Loki Technologies - Unstoppable Websites
http://www.lokitech.com/
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