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From "Chaudhuri, Hiran" <Hiran.Chaudh...@softwareag.com>
Subject RE: Newsgroup integration, and other questions
Date Wed, 15 May 2002 21:25:47 GMT
Hi, Danny.

Thank you for that explanation. Yes, I was no longer aware of those MX
records that need to be queried. What I thought of was only the hostname
that might need resolution.


Hiran Chaudhuri
SAG Systemhaus GmbH
Elsenheimerstra├če 11
80687 M├╝nchen
Phone +49-89-54742-134
Fax   +49-6151-9234-5134

> -----Original Message-----
> From: Danny Angus [mailto:danny@thought.co.uk]
> Sent: Wednesday, May 15, 2002 10:56 AM
> To: James Developers List
> Subject: RE: Newsgroup integration, and other questions
> Hiran
> > So why does a MTA by itself need to know the DNS server's ip
> > addresses? BTW,
> > I never entered such information and did not see any problems.
> MTA's use MX records to find a list of all MTA's to whom they 
> could deliver
> mail for a specified domain.
> If this list isn't found, or all of those hosts cannot be 
> contacted the MTA
> can try to deliver directly to the domain of the address.
> Thus most mail domains actually map to servers whos name is 
> different to the
> mail domain, in which case no DNS prevents this being delivered.
> Some mail is correctly delivered directly to the domain.
> Java doesn't (AFAIK) have a simple method of determining MX 
> record lists or
> the nameservers from OS network config, and local name resolution
> (etc/hosts) doesnt contain MX information. Therefore James 
> needs to know the
> IP of a nameserver from which it can get MX records.
> Sendmail can find the nameservers from OS config, so you don't have to
> configure this parameter for it, but it isn't as portable as James.
> Likewise, I expect, for other platform specific MTA's.
> If Java does have a way of getting lists of MX records 
> without knowing DNS
> addresses do let us know about it.
> d.
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