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[POSTFIX] SASL authentication failure

[POSTFIX] SASL authentication failure

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Detection Logic

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[POSTFIX] SASL authentication failure"; content: "authentication failed"; default_proto: tcp; default_dst_port: $SMTP_PORT; default_proto: tcp; default_dst_port: $SMTP_PORT; classtype: unsuccessful-user; program: postfix; sid: 5000227; rev:3;)

Field Validations

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