Lookup of commercial e-mail adresses

[Tims777]

For SumUp and the training of our AI model it is beneficial, if we can aggregate information from a multitude of different data sources. For an overview of current data sources see here: Data Source Table

Done?

• Required fields (orange) in Data Sources table have been filled out
• Implementation is able to retrieve supported features that are not marked as unimplemented

[luccalb]

Added the following fields during the AnalyzeEmails Steps (formerly EnrichCustomDomains):

• email_valid: result of email check
• first_name_in_account: indicator if first name is part of email account
• last_name_in_account: indicator if last name is part of email account

I plan on using this information for better google searches. E.g. if only the last name (or no name) is present, that could indicate a business name (malermeister.meyer@gmx.de) while max.muster@gmail.de will likely not yield business results.