#1 Example from postfix from dbts #507990
Dec 2 22:24:22 hel postfix/smtpd[7676]: warning: 114-44-142-233.dynamic.hinet.net[114.44.142.233]: SASL CRAM-MD5 authentication failed: PDc3OTEwNTkyNTEyMzA2NDIuMTIyODI1MzA2MUBoZWw+