Hi
We can't validate the address without executing the job, so you have to iterate each address and send the info one by one, and you can know which address is invalid. For example:
parent job:
tForEach--iterate--tRunJob

child job:

tSendMail
    |
onsubjoberror
   |
tFixedFlowInput--main--tFileOutputDelimited

on tRunJob: call the child job, uncheck the box 'die on error', pass the current iterate address to child job using context variable.

on tFixedFlowInput and tFileOutputDelimitedt: generate current address and write it to a file.

Best regards
Shong