Best design pattern for my application use case

I am trying to develop to develop a mailing application. I have a set of procedures like

Abuse checking, anti-spam verification, validating email and other procedures.

I have looked at chain of responsibility and listener patterns but I am not hundred percent okay with either of those and I would like to use a customized pattern which is a combination of both the patterns. Which is the best design pattern to use in this case? Is there any design pattern/existing implementation which you have come across which fits into my use case?