This extension adds simple database records, that can be used to generate a select field in the frontend. The selected option can be accessed with an assigned alias and thus be used as a dynamic recipient, e.g. in the Recipient address field.

Clone to typo3conf/ext/form_dynamic_recipient

git clone https://github.com/extrameile/form_dynamic_recipient.git

or install via composer

composer require extrameile/form-dynamic-recipient

• Create database records with a label and target email address
• add a select field of type Selectable recipient to the form, configure the page to load the values from and the variable to fill with the selected value, e.g. dynamicRecipient
• Configure the Email to receiver finisher with {dynamicRecipient.email} and {dynamicRecipient.label} - set the form field to required, if you use {dynamicRecipient.email} as the target email address.

• validate submitted option to contain a uid from the records of the configured storage page

• https://daniel-siepmann.de/Posts/2017/2017-09-07-typo3-form-select-with-db-values.html
• https://github.com/tritum/form_element_linked_checkbox