Exit/Enhancement for External Send

Hi all,

I have a requirement that needs to retrieve the correct email recipient of vendor(this is for PO). A custom output type for External Send is maintained in NACE. The vendor has two email address maintained (one with a note that it is for PO), I can check which email address is correct through tables ADR6 and ADRT. Buts there any exit/enhancement where I can add the logic for this?

Thanks,

Eo