# For developers

Powermail can be extended in similar ways. If you want to execute something on a submit, look at the Finisher Classes.
If you want to add own spamshield methods, look in this chapter, etc...

* [AddFinisherClasses](/ForDevelopers/AddFinisherClasses.md)
* [AddSpamshieldMethods](/ForDevelopers/AddSpamshieldMethods.md)
* [DisableSpamshield](/ForDevelopers/DisableSpamshield.md)
* [EventDispatcher](/ForDevelopers/EventDispatcher.md)
* [AddNewFields](/ForDevelopers/AddNewFields.md)
* [AddNewFieldProperties](/ForDevelopers/AddNewFieldProperties.md)
* [AddNewFlexFormProperties](/ForDevelopers/AddNewFlexFormProperties.md)
* [WriteOwnValidators](/ForDevelopers/WriteOwnValidators.md)
* [AddDataProcessors](/ForDevelopers/AddDataProcessors.md)
* [UserfuncsWithCobject](/ForDevelopers/UserfuncsWithCobject.md)
* [DatabaseModel](/ForDevelopers/DatabaseModel.md)
* [Local Development with Docker](/ForDevelopers/LocalDevelopment.md)