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Netzzwerg

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Hello together !

I have to configure a mailserver in our office in Germany and Kerio Mailserver is totally new for me.

First of all some facts:

- mailserver is installed on same machine i work with (for testing)
- internal domain in our office (homezone.local)
- DSL connection with dynamic IP
- pop3-account at german ISP "1und1" for testing

I managed to configure the POP3 account, so the mailserver is able to receive emails from my ISP's pop3 server "pop.1und1.de" and forward them to my internal e-mail address "admin<_at_>homezone.local". That works fine and i can look at my mails via the Kerio Webmail-Client or Outlook.

The problem is when i try to send mails from my domain-internal Mail-Address to my external Address at 1und1. I configured Kerio Mailserver (Configuration -> SMTP Server -> SMTP Delivery), so it should be able to send mails over smtp ?! The log file reports the following:

[04/Aug/2006 10:42:54] Recv: Queue-ID: 44d3088e-00000003, Service: SMTP, From: <admin<_at_>homezone.local>, To: <xyz<_at_>1und1.de>, Size: 1335, Sender-Host: 192.168.0.38
[04/Aug/2006 10:43:27] Sent: Queue-ID: 44d3088e-00000003, Recipient: <xyz<_at_>1und.de>, Result: delayed, Status: 4.1.8 421 dns lookup failed for sender domain

I have no experiences with more complex mailservers so far, but i think it's a more generell problem with DNS and so on.

I would be very thankful, if someone could help me :)


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himo

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Hi from Germany to Germany :-)
You?re right it?s a (kind of) DNS Problem.

The 1und1 mailserver try to resolve your Domain Name (localhost.zone), after this resolve it will do an reverse lookup at your IP.
The mailserver compares your Domain with your IP and vice verca.
If there?s a difference you will get this error message.

Even if you don?t send your mails via relay host, you have to look that your IP will be resolved in www, and that a reverse lookup with your IP will get the same Domain.
Concerning Spam a lot of mailserver will bounce emails that won?t pass this test above.

Hope I could help you
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teco

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It's an security feature from 1und1.

Call support from 1und1 and tell them that you are trying to config the SMTP to be relayed by 1und1.

Also tell them that you have your own mailserver and that you are not using exchange.

Please be aware if you have a catch all account it must be configured that it is not possible to send mails with this adress. Otherwise they deny the SMTP Relay.

We have our server also relayed with the SMPT from 1und1.

Dynamic IP is not a problem.
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slash

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hi

another option would be the use of one of these dynamic dns services like dyndns.
Set up your primary domainname to this dyndns service name (example.dyndns.net) and create one or more internal domainnames.
Now, 1und1 mailserver will be able to make these reverse dns lookups to your dyndns adress.

greets
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