I don't know why I would be flagged but I have not played on minecraft in MONTHS and decided to jump back on my old favorite server. Why would I be getting this message, and is there any way to resolve it? It won't let me join the server :/

You or the last person to use your IP address had malicious software that caused you/them to be part of a botnet or an internet spammer cycle. For information about becoming unblacklisted, check out http://cbl.abuseat.org/