Postfix connection lost after AUTH

Posted by user84104 on Server Fault See other posts from Server Fault or by user84104
Published on 2011-11-29T21:08:16Z Indexed on 2011/11/30 1:55 UTC
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postfix

Looking at the logs on my mailservers, I have noticed messages like the following:

Nov 29 12:09:38 mta postfix/smtpd[8362]: connect from unknown[183.13.165.14]
Nov 29 12:09:39 mta postfix/smtpd[8362]: lost connection after AUTH from unknown[183.13.165.14]
Nov 29 12:09:39 mta postfix/smtpd[8362]: disconnect from unknown[183.13.165.14]
Nov 29 12:09:39 mta postfix/smtpd[8409]: connect from unknown[183.13.165.14]
Nov 29 12:09:40 mta postfix/smtpd[8409]: lost connection after AUTH from unknown[183.13.165.14]
Nov 29 12:09:40 mta postfix/smtpd[8409]: disconnect from unknown[183.13.165.14]

There are no SASL failures in these cases. There are SASL failures are logged at other times, but never with lost connection after AUTH.

What is happening here, and should I do any about it?
These are not MXs, and already have smtpd_client_connection_rate_limit set.

Possibly related:
The systems require either SMTPS or STARTTLS before AUTH is announced.

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Postfix connection lost after AUTH - Developer IT

Postfix connection lost after AUTH

postfix

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