alert tcp $EXTERNAL_NET any -> $HOME_NET 143 (msg:"GPL IMAP append overflow attempt"; flow:established,to_server; content:"APPEND"; nocase; isdataat:100,relative; pcre:"/\sAPPEND\s[^\n]{256}/smi"; reference:bugtraq,11775; classtype:misc-attack; sid:2103066; rev:3; metadata:created_at 2010_09_23, confidence Medium, signature_severity Minor, updated_at 2019_07_26;)