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Error: "450 Client host rejected: cannot find your hostname"

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Jacob Hatt

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Oct 23, 2004, 12:44:18 AM10/23/04
to
Hi
I have sent a message from m...@mydomain.com to
us...@anotherdomain.com, but it bounced back with the
following error:

host mail.anotherdomain.com[xxx.xxx.xxx.xxx] said: 450
Client host rejected: cannot find your hostname,
[yyy.yyy.yyy.yyy] (in reply to RCPT TO command)

I am not sure what this exactly means. yyy.yyy.yyy.yyy
is the IP of my firewall firewall.mydomain.com, and it
also points to my mail server mailserver.mydomain.com.
mydomain.com has a different IP. Is this there a
problem here? I have not had a similar error before.

I would appreciate your help. Thanks.


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Messenger - all new features - even more fun! http://uk.messenger.yahoo=
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Ralf Hildebrandt

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Oct 23, 2004, 3:02:30 AM10/23/04
to
* Jacob Hatt <jaco...@yahoo.co.uk>:


> host mail.anotherdomain.com[xxx.xxx.xxx.xxx] said: 450
> Client host rejected: cannot find your hostname,
> [yyy.yyy.yyy.yyy] (in reply to RCPT TO command)

Postfix cannot find the hostname for yyy.yyy.yyy.yyy

--
Ralf Hildebrandt Ralf.Hil...@charite.de
http://www.arschkrebs.de/postfix/ Tel. +49 (0)30-450 570-155
Never underestimate the bandwidth of a station wagon full of tapes.
-- Dr. Warren Jackson, Director, UTCS

Jacob Hatt

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Oct 23, 2004, 4:58:45 AM10/23/04
to
Am I right in thinking this problem can be solved by
setting a PRT record for yyy.yyy.yyy.yyy?

Thanks.


Jacob

--- Ralf Hildebrandt <Ralf.Hil...@charite.de>
wrote:=20
> * Jacob Hatt <jaco...@yahoo.co.uk>:
> =20


> > host mail.anotherdomain.com[xxx.xxx.xxx.xxx] said:
> 450
> > Client host rejected: cannot find your hostname,
> > [yyy.yyy.yyy.yyy] (in reply to RCPT TO command)

>=20


> Postfix cannot find the hostname for yyy.yyy.yyy.yyy

>=20
> --=20
> Ralf Hildebrandt =20
> Ralf.Hil...@charite.de
> http://www.arschkrebs.de/postfix/ =20


> Tel. +49 (0)30-450 570-155
> Never underestimate the bandwidth of a station wagon
> full of tapes.
> -- Dr. Warren Jackson,
> Director, UTCS

> =20

Ralf Hildebrandt

unread,
Oct 23, 2004, 6:48:28 AM10/23/04
to
* Jacob Hatt <jaco...@yahoo.co.uk>:

> Am I right in thinking this problem can be solved by
> setting a PRT record for yyy.yyy.yyy.yyy?

Yes :)

--
Ralf Hildebrandt Ralf.Hil...@charite.de
http://www.arschkrebs.de/postfix/ Tel. +49 (0)30-450 570-155

To do the actual install you have to be root, but none of the normal
build should require that. Don't take the name of root in vain.
- /usr/src/linux/README

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