# TYPO3 Extension powermail - Documentation - 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](/Documentation/ForDevelopers/AddFinisherClasses.md)
* [AddSpamshieldMethods](/Documentation/ForDevelopers/AddSpamshieldMethods.md)
* [DisableSpamshield](/Documentation/ForDevelopers/DisableSpamshield.md)
* [SignalSlots](/Documentation/ForDevelopers/SignalSlots.md)
* [AddNewFields](/Documentation/ForDevelopers/AddNewFields.md)
* [AddNewFieldProperties](/Documentation/ForDevelopers/AddNewFieldProperties.md)
* [AddNewFlexFormProperties](/Documentation/ForDevelopers/AddNewFlexFormProperties.md)
* [WriteOwnValidators](/Documentation/ForDevelopers/WriteOwnValidators.md)
* [AddDataProcessors](/Documentation/ForDevelopers/AddDataProcessors.md)
* [UserfuncsWithCobject](/Documentation/ForDevelopers/UserfuncsWithCobject.md)
* [DatabaseModel](/Documentation/ForDevelopers/DatabaseModel.md)