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bomor

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In my security log I can see a lot of dictionary attacks for SMTP login:

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[21/Nov/2016 09:40:36] SMTP: User knife<_at_>mydomain Kerio Connect 9.2.0 doesn't exist. Attempt from IP address XXX.XXX.XXX.XXX.
[21/Nov/2016 09:40:42] Failed SMTP login from XXX.XXX.XXX.XXX with SASL method LOGIN.
[21/Nov/2016 09:43:16] SMTP: User koko<_at_>mydomain Kerio Connect 9.2.0 doesn't exist. Attempt from IP address XXX.XXX.XXX.XXX.
[21/Nov/2016 09:43:22] Failed SMTP login from XXX.XXX.XXX.XXX with SASL method LOGIN.
[21/Nov/2016 09:45:56] SMTP: User kontakt<_at_>mydomain Kerio Connect 9.2.0 doesn't exist. Attempt from IP address XXX.XXX.XXX.XXX.
[21/Nov/2016 09:46:02] Failed SMTP login from XXX.XXX.XXX.XXX with SASL method LOGIN.
[21/Nov/2016 09:49:02] SMTP: User kontor<_at_>mydomain Kerio Connect 9.2.0 doesn't exist. Attempt from IP address XXX.XXX.XXX.XXX.
[21/Nov/2016 09:49:08] Failed SMTP login from XXX.XXX.XXX.XXX with SASL method LOGIN.
...


How to block this in Kerio?

A security option "Max. number of failed commands in a SMTP session" doesn't help.
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