You can use Email validation UDF for the same...try with below code..
public void validate(String emailid[],ResultList result,Container container)throws StreamTransformationException{
for(int i=0;i<emailid.length;++i)
{ if(emailid[i].matches("^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"))
{ return emailid;
}
else
{ return (Set condition as per your requirement);
}
}
}
In mapping set a Condition..
Source Email Field > UDF Validation > Target Email Field
Hope it helps.!
Regards,
Sunil