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File name : courier-smtp.conf

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

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