# set: defscore=10
SMTP protocol synchronization error \(input sent without waiting for greeting\): rejected connection from .*\[<HOST>\]
SMTP protocol synchronization error \(next input sent too soon: pipelining was not advertised\): rejected .*\[<HOST>\]
rejected [HE][EH]HLO from \[<HOST>\]: syntactically invalid argument
\[<HOST>\] .* host is listed in .+
\[<HOST>\] .* relay not permitted
\[<HOST>\] .* rejected after DATA: This message was detected as possible malware
# set: defscore=5
\[<HOST>\] .* too many connections from that IP address
\[<HOST>\] .* temporarily rejected RCPT \<\S+\>: lowest numbered MX record points to local host