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philipp_hauser

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Hi there,

is there a way of relaying a mail to an unknown recipient to an external mailserver?

Actually we have this use case:

We have an external mail provider, through which we send and receive emails to kerio (smtp relay and pop3).

But some mailboxes on the external mail provider are not handled by kerio, as they should be available worldwide through the providers web interface. Even so these mailboxes have the same domain as those handled by kerio. ("user@domain.de" for kerio and "user.temp<_at_>domain.de" for non kerio)

Now there is the problem, that we can't send a mail from kerio to "user.temp<_at_>domain.de" as the recipient is unknown to kerio.

I found an option on the kerio administration interface under "Domain->forwarding" where you can specify a smtp host for forwarding emails to unknown recipients.
But unfortunately the smtp host of our external mail provider requires authentication.
Is there a way to provide log in information for this host or is there another way of solving my problem?

Thanks in advance!
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Kedar

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The provider's SMTP server MUST NOT require authentication if the final recipient is local on their server. (AFAIK it's defined in somewhere in RFC)
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clan

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Radek Sip (Kerio) wrote on Wed, 07 May 2014 09:08
The provider's SMTP server MUST NOT require authentication if the final recipient is local on their server. (AFAIK it's defined in somewhere in RFC)
I don't think there is a requirement like this, but it would make mail delivery mostly impossible to require authentification for local recipients...

Quote:
I found an option on the kerio administration interface under "Domain->forwarding" where you can specify a smtp host for forwarding emails to unknown recipients.
But unfortunately the smtp host of our external mail provider requires authentication.
Is there a way to provide log in information for this host or is there another way of solving my problem?
Did you try this out without authentification? If the recipents are local to the external server it should work. Just make sure the mail is not passed back to your local server again...
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philipp_hauser

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I tried without authentication and got this in my logfile:

Sent: Queue-ID: xxxx-xxxx, Recipient: <user.temp<_at_>domain.de>, Result: failed, Status: 5.1.8 530 5.7.0
Please configure your mail client for using SMTP Server Authentication, Remote-Host: smtp.strato.de, Msg-Id: <xxxx.xxxx<_at_>domain.de>

[Updated on: Wed, 07 May 2014 09:59]

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freakinvibe

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What port and host have you configured under Domain -> forwarding? It must be port 25 and the host name must be the one in the MX record of your domain.

[Updated on: Wed, 07 May 2014 17:56]


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