Nathan Harris writes:
On 7/8/2016 10:58 AM, Gordon Messmer wrote: > On 07/08/2016 06:49 AM, Nathan Harris wrote: >> Is there anything more >> sophisticated or a better approach to solving this problem? > I'd recommend that you not allow authentication on any non-encrypted > protocols, and that'll only leave log analysis tools like fail2ban as > options. > Gordon, first let me start with a big thank you for pythonfilter which I have used for years. As far as rejecting/disabling smtp authentication, I was not aware there was a setting for this.
Set ESMTPAUTH and ESMTPAUTH_TLS to an empty string, in the esmtpd configuration file.
Before doing that, copy the current settings to the esmtpd-msa configuration file, its CUSTOM section is for that; so that authenticated smtp is still enabled on port 587.
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