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PKJ

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Dear All,

I am getting message "Attempt to deliver to unknown recipient " under security log. Is there any setting in Kerio Connect that will inform the sender that the recipient is not valid.


Thanks & Regards,
Prabhat
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Grabsteinschubser

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Kerio (like every other mailserver software) returns a bounce message with all details to the sender. You don't have to activate it. It's always activated because of RFC 3461, RFC 3463 and RFC 3464.
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PKJ

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But i am not getting any error email.
For example, if i am sending email from my yahoo address to my Kerio Connect email address like no user@mydomain.com; i am not getting any Failure Notice in my yahoo email and in security log in Kerio i can see "Attempt to deliver to unknown recipient" nouser<_at_>mydomain.com from IP ......

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Grabsteinschubser

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Ok, I will try to explain how it works. Sender = S, Recipient = R

S writes email to R and clicks "send".
Mailserver S asks Mailserver R: "I have an email for R"
Mailserver R answeres: "Nope, I do not know any R"
Mailserver S says: "Ok, that's a pity :("
Mailsever S talks to S: "Hey there, at Mailserver R there is no R."

So I was not correct when I said: Kerio returns a bounce message. Correct is that Kerio will notify the senders mailserver that the user is unknown. And the senders mailserver will return a bounce message to the senders mailbox.
Have you tried another mail provider (like gmail)? Maybe yahoo has failed (or tries to resend your message for the next days)?

This is what I got when I tried to send an email to an non-existent user:
Mail Delivery Subsystem <mailer-daemon<_at_>googlemail.com>
16:58 (vor 10 Minuten)

an mich 
Delivery to the following recipient failed permanently:

     recipient<_at_>mydomain.tld

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain mydomain.tld by mymx.tld. [1.2.3.4].

The error that the other server returned was:
550 5.1.1 Mailbox <recipient<_at_>mydomain.tld> does not exist

[Updated on: Mon, 13 April 2015 17:13]

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ComputerBudda

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On a related topic, I've noticed when a user borks the domain for the user, goodusers<_at_>gmai.com, the message just sits on the outbound queue for a long time with an error message that it cannot resolve the address. I eventually just delete them.

What is suppose to happen here.
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Grabsteinschubser

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When you delete it the user gets a notification that the email was manually removed from the message queue. But the user will never know why it has been deleted unless you explain it to your user.

If you do not delete it then probably the user gets a "non delivery notification" after the timeout period you set on "Configuration" - "SMTP Server" - "Queue Options" - "Bounce the message to sender if not delivered in:"

[Updated on: Mon, 13 April 2015 17:39]

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ComputerBudda

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thank you very much. I just cleaned up that puppy.
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PKJ

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Got it, thanks for explanation. It works in other mail provider.
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