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I have a problem receiving mail at the submission smtp port 587. This is the situation:
- I have 2 Kerio Mailservers (6.7) which are used as forwarding mailservers. They are colocated, so no restriction with blocked ports and all the relevant ports are opened.
- At home I have also a Kerio Connect mailserver (7.0).
- I know for sure that al the DNS settings are correct.
- Because my ISP blocked smtp port 25, I forward one of my domains ( the forwarding mailservers directly to the public IP of my home at port 587.
- Of course all the relevant ports on the home Kerio server are opened and also my router pointed those port to the Kerio server.
- At the home Kerio server it's no problem to sent out mails. I used the SMTP server of my ISP provider. So no problem for that at all.

But when a mail is sent to the info[at] the forwarding mailserver generates a fault; "Recipient: <info[at]>, Result: failed, Status: 5.1.8 550 5.7.1 Authentication Required"
For your information, there is no visible action on my home Kerio server (the maillog shows nothing)

I tried to changed some parameters on both forwarding and home Kerio servers, but I can't figure out how to fix this.

How to fix this problem, so that when a mail is sent to info[at] it's the home Kerio mailserver normal receives it.

[Updated on: Sat, 01 May 2010 12:36]


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Kerio SMTP forwarding can't/don't use autorization, and SMTP Submission (on 587) will only accept connections from users with autorization - catch 22!

You need to make a second listener on the Normal SMTP service, like on port 2525 and forward to that!
Or ask your ISP to open port 25! (at least from the IP's of your servers - unless the EULA state you can't run a server on the line.. Wink


Jakob Peterhänsel
Consultant - Humac A/S

Apple Certified Support Professional (ACSP)
Apple Certified Technical Coordinator (ACTC)
AppleSeed/CQF member since 1998
Kerio Messaging Partner

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That did the trick. Added port 2525, forwarded it to the kerio server at home and also opened 2525 on the firewall. Works like a charm.

Thank's mate!!
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