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# Fail2Ban filter to block relay attempts though a Courier smtp server##[INCLUDES]# Read common prefixes. If any customizations available -- read them from# common.localbefore = common.conf[Definition]_daemon = courieresmtpdfailregex = ^%(__prefix_line)serror,relay=<HOST>,.*: 550 User (<.*> )?unknown\.?$^%(__prefix_line)serror,relay=<HOST>,msg="535 Authentication failed\.",cmd:( AUTH \S+)?( [0-9a-zA-Z\+/=]+)?(?: \S+)$ignoreregex =# Author: Cyril Jaquier