Network identity for sending mail.

[Malcolm Kay]

On Sun, 16 Mar 2008 06:46 pm, Erik Trulsson wrote:
> On Sun, Mar 16, 2008 at 06:17:47PM +1030, Malcolm Kay wrote:
> > The send-pr appears to assume that mail can and will be sent
> > directly through sendmail or equivalent rather than inderctly through
> > an ISP mail service.
> 
> Does it not work if you configure sendmail to send via your ISP's mail
> server?

Sounds good, but how?

> 
> > I can certainly successfully send mail directly
> > via sendmail but as I don't have a static IP address or a registered
> > name the (bogus?) name used is not able to be validated. So when I send-pr
> > I get a returned mail message which includes the following:
> > 
> >    ----- The following addresses had permanent fatal errors -----
> > <FreeBSD-gnats-submit at freebsd.org>
> >     (reason: 450 4.7.1 <mail.whatnot.on.net>: Helo command rejected: Host not found)
> > 
> > It seems most destinations are not so pedantic and accept the (bogus) name.  
> > 
> > Now if I set up sendmail with some registered name in place of mail.whatnot.on.net
> > then I believe the message will be accepted.
> 
> Perhaps, but most likely whatever name you supply will have to resolve to
> the same IP it was sent from for it to be accepted.
> 
> > 
> > So the question is would it be legitimate or fraudulent to set sendmail to work with
> > the name of my ISP's mail server in the Helo command -- after all this is the rout that 
> > will be followed by any responses.
> > 
> > Is there a better way around the difficulty.
> 
> You could also use dynamic DNS (see e.g. www.dyndns.org) to get a real
> hostname that sendmail (and other services) can use.

Yes; somewhat cumbersome although it also gains some other advantages.

Thank you,
Malcolm