I have this information available within my delimited text input file:

Attributes: Name, dottedname, domainname, more
Example: Rene, rene.boos, company.nl,

I don't need dottedname and domainname seperatly, so they are not in my
Mapping rule. It would only fill my eDir with unneeded information.
But I want to construct the Internet email adress with those 'source

Like so:
Internet email adres = "dottedname +'@'+ domainname"

Because it's a delimited text driver I cann't query the source attribute
I do not understand how I can use the attributes from my text file when
they are not in the Mapping Rule.