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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: [gentoo-user] [OT] Setting up correct domainname
Date: Sun, 20 Sep 2009 12:30:24 +0100
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Hi All,
Up until a few months ago the ISP of the network in question was happy to=20
accept and relay messages from my server <myserver.mydomain.com> which runs=
=20
nagios. My server gets its IP address from the ISP in question dynamically=
=20
so I use DynDNS to map the subdomain.domain name to it.
To be able to relay messages I of course have set up sendmail to authentica=
te=20
using email_account@ISP.com/passwd_on_ISP.
When the ISP stopped accepting messages I started getting this error messag=
e:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
=2D----The following addresses had permanent fatal errors-----
<email_account@ISP.com>
(reason: 550 5.1.0 <nagios@myserver.mydomain.com> sender rejected : inval=
id=20
sender domain)
=2D----Transcript of session follows -----
=2E.. while talking to smtp.ISP.com:
>>> MAIL From:<nagios@myserver.mydomain.com> SIZE=3D745 AUTH=3D<>
<<< 550 5.1.0 <nagios@myserver.mydomain.com> sender rejected : invalid send=
er
domain
554 5.0.0 Service unavailable
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Does this fail because the ISP's reverse DNS on my dynamically allocated IP=
=20
address resolves to an ISP domain instead of myserver.mydomain.com?
Is there something I could change in the configuration of my server to make=
=20
this work again?
=2D-=20
Regards,
Mick
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