My logs are fullfilled with this:

Jan 20 20:05:26 linzer postfix/smtpd[22308]: warning: hostname c942452695-cloudp
ro-214859053.cloudatcost.com does not resolve to address 167.88.40.162: Name or 
service not known
Jan 20 20:05:26 linzer postfix/smtpd[22308]: connect from unknown[167.88.40.162]
Jan 20 20:05:28 linzer postfix/smtpd[22308]: warning: unknown[167.88.40.162]: SA
SL login authentication failed: authentication failure
Jan 20 20:05:29 linzer postfix/smtpd[22308]: lost connection after AUTH from unk
nown[167.88.40.162]
Jan 20 20:05:29 linzer postfix/smtpd[22308]: disconnect from unknown[167.88.40.1
62]

Is there any way to know what username was used in these attempts.
(An existing one every time or they are choosen from a dictionary?)

Gabor
-- 
The Meaning of Life of Brian

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