> * Karel Kulhavy <[EMAIL PROTECTED]> [2007-11-06 05:09:29]:
> >
> > If I configure my exim on my laptop according to what's written in
> > the comments, I cannot send e-mail to [EMAIL PROTECTED]
> >
> > The comment says that primary_hostname should be "your host's canonical name
> > [...] the fully qualified "official" name of your host". Well my laptop is
> > called kestrel and my domain is twibright.com. So I put
> > kestrel.twibright.com there.
> >
> > But [email protected] says rejected since sender verify failed.
Please quote the entire error message exactly.
> > The "from" header is set to [EMAIL PROTECTED],
> > the "from:" header to > > [EMAIL PROTECTED]
> > No wonder it failed. My laptop doesn't have any externally valid IP address
Then don't send mail form it directly.
> > so I didn't make any DNS record for it. misc apparently tries to lookup
> > kestrel.twibright.com and fails.
My mailserver does this too. If either the SMTP client's hostname or the
HELO hostname cannot be resolved back and/or forth, the mail is rejected.
This catches about 90% of the hundreds of spam I get every day.
> > So I tried to put "twibright.com" there
Where "there"?
> > but now I cannot send post to my
> > brother [EMAIL PROTECTED] Now exim thinks [EMAIL PROTECTED] is for
> > him (even if local_comains are set just to @ : localhost) and says
> > "unknown user". -t mx for twibright.com is twin.jikos.cz.
That's your exim's problem. Configure it properly.
>> Or should I put some random bullshit like 195.195.195.195 into the
>> kestrel.twibright.com so that misc@ is satisfied?
It would be my guess that misc@ is clever enough to also check if the reverse
DNS record points back to kestrel.twibright.com
> > Is there a RFC saying that the "from" header after stripping the
> > @ and before must succeed in DNS lookup?
I don't know whether there is an RFC saying mailservers must/should do
this check, but they definitely do that (mine does, too) to fight spam.
> > Do I violate any RFC if I put random garbage into DNS
> > to satisfy paranoid hosts like [EMAIL PROTECTED]
Do I violate any RFC if I suggest you are out of your tiny little mind?
> > All these "anti-spam" policies... They just make it almost impossible for
> > normal people to send e-mail reliably, while they have no visible effect
> > on the spam tsunami... I still get hundreds of spams daily. They turn the
> > MTA configuration task from a fifteen puzzle into a sixteen puzzle.
If you want to send mail to a public mailing list, do it from a machine
whose name the mailserver can resolve back and forth, or make such
machine relay for you. Your ISP definitely does provide this service.
Jan
