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Where to change plesk_saslauthd log level?

Baxil

New Pleskian
Plesk 12.0.18 Update #70, Ubuntu 14.04.3 LTS.

Our postfix mail log file is filled with millions of lines like the following:

Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: activity on 1 channel(s)
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: new client (fd=10) registered
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: main cycle iteration
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: activity on 1 channel(s)
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: some read activity on client 10
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 2)=2
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=0]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 7)=7
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=1]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 2)=2
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=2]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 8)=8
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=3]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 2)=2
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=4]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 4)=4
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=5]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 2)=2
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=6]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: read(10, &buf, 15)=15
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: processing client data chunk [state=7]
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: failed mail authenticatication attempt for user 'xxxxxxxxxxxxxxx' (password len=9)
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: main cycle iteration
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: activity on 1 channel(s)
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: some write activity on client 10
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: attempt to write(10, &buf, 4)
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: client 10 processed
Oct 28 17:00:42 cloud8 plesk_saslauthd[17698]: main cycle iteration
Oct 28 17:00:42 cloud8 postfix/smtpd[17706]: warning: unknown[x.x.x.x]: SASL LOGIN authentication failed: authentication failure​

This is causing the log file to grow to unmanageable sizes.

I have tried decreasing the log_level in /etc/postfix/sasl/smtpd.conf from 4 to 1 with no change.
http://kb.odin.com/en/113866 suggests changing it at
/usr/lib64/sasl2/smtpd.conf but that file does not exist (nor in /usr/lib/sasl2).
http://kb.odin.com/en/125625 suggests adding "sql_verbose: no", but that has no effect either.
In both cases I reloaded postfix after the changes.

Where is the log level for plesk_saslauthd set, and what log level removes all of the debugging information except for the "failed mail authentication" line?
 
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