Hi,
a short report from our cluster: Every system has been hit with this "test" :2023-10-02 04:48:31 SMTP call from (hello) [152.32.233.30] dropped: too many syntax or protocol errors (last command was "AUTH NTLM TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA=", C=EHLO,HELP,AUTH)
"TlRMTVNTUAABAAAAB4IIAAAAAAAAAAAAAAAAAAAAAAA=" decodes to "NTLMSSP" They try it with and without the base64 string:2023-10-02 03:45:48 SMTP call from (XXXXXXXXXXX) [152.32.132.194] dropped: too many syntax or protocol errors (last command was "AUTH NTLM", C=EHLO,AUTH)
AUTH NTLM and EXTERNAL are not supported by Exims default config in Fedora, which leads to the above message if a "no errors allowed" policy is in place.
"AUTH EXTERNAL" has not been tested and other attempts could not be identified yet.
best regards, Marius
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