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Home » GFI User Forums » Kerio Connect » Messages rejected "authentication" problems (Problem relaying messages received from other mails.)
Messages rejected "authentication" problems [message #150530] Sun, 14 November 2021 16:59 Go to next message
torbianchi is currently offline  torbianchi
Messages: 3
Registered: October 2021
Since we enabled the "anti-spoofing features, we begun to reject some messages received from other systems to one of our internal domains (we have more than one). We disabled the anti-spoofing but problem is still present. We have an SMTP server (kerio one) that only receives messages sent to one of our domains. We have a main domain "" with an alias "". When We send mails from, for example, gmail, to one user to its main mailboxes, eg. the mail is received. When we send the same message to its alias mailbox, it is rejected in the Kerio SMTP server resulting in "Relay attempt from ip address ..... rejected". In the Gmail side we receive a 550 5.7.1 Relaying to <xxxx<_at_>> denied (authentication required. This problem begun when we tried to activate anti-spoofing and ot continues no matter we went back with this. We also noted that at the same time, in the Warning logs appeared:
- IM external process is not responding or is not running, trying to start it again...
- IM external process is not responding or is not running, closing all client sessions...
- XMPP server timeout .......
Those warnings are also new and we dont have IM nor XMPP enabled.
Re: Messages rejected "authentication" problems [message #150535 is a reply to message #150530] Mon, 15 November 2021 12:42 Go to previous message
freakinvibe is currently offline  freakinvibe
Messages: 597
Registered: April 2004
First of all, the IM and XMPP warnings are completely unrelated to your relaying problem. We have them as well, but does not cause any problems. So I would not loose any time on those.

Can you let me know which settings are enabled on:

Configuration > SMTP Server > Relay control > Allow relay only for


Configuration > Security > Sender Policy

Dexion Services AG - IT Support Services in Basel, Switzerland
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